[OH] How should a contractor respond to a construction dispute when a customer refuses to pay and keeps making demands?

Is there someone familiar with Ohio laws with construction dispute with a customer?

It has been a headache throughout with the customer angrily texting us, customer stopping work on the jobsite, customer making demands, customer threatening to contact their attorney, customer threatening to badmouth us online, and now customer refusing to pay when I showed up at their home at an agreed upon time on March 3 after they agreed to terms of moving on with a $10,000 discount. They then told me to get off their deck and leave their property. They tried to text on Friday (March 6) and on Saturday asking how we are going to resolve the matter; we did not respond. They tried to call on Friday; I only said that I wasn't comfortable saying anything (I wrote out what was said and saved it in the March 3 subfolder). I made a Google Drive folder with all communications, photos, and I tried my best to draft a walk away agreement/demand letter. The link is shared below.

Questions We Have: What is our best course of action?

1. We would like to be paid for the work that was done (just shy of $20,000 they have refused to pay). They are upset about a sheen difference between the Hardie baked in finish and the Hardie touch up paint, but that isn't a reason not to pay. While we want to be paid and deserve to be paid, I didn't bold this as it isn't our top concern.

2. We do not want to warranty this job as they agreed for someone else to complete it, and this customer has been a nightmare. We have paid thousands in additional materials and a second crew to make them happy, and they keep moving the target and threatening us and being verbally aggressive.

3. We want to move on and walk away as we agreed to via text. We do not want to come back and complete the work.

4. We want to protect ourselves legally from them coming back at some point. The work was done correctly; we just want to make sure anything we write or say won't harm us.

5. We want to know if we should consider the mechanic's lien.

Cliff Notes Version of the Situation:

We started a siding job in the fall. We experienced a lot of delays with weather, material delays, scheduling, and our first subcontractor left some messes. We required the subcontractor to make corrections. The homeowner demanded that the corrections only be done by the subcontractor, not crew members and that we were present. The customer remained dissatisfied so we had to take the first subcontractor off the job. We hired a second subcontractor and purchased additional materials to make the customer satisfied. The customer continued to text us aggressively and stop work at the site, and demand that we be present for them to allow the subcontractors to begin working again.

On January 13, we, the customer, and the second subcontractor did a property walk where we took pictures and video and wrote out all the solutions that were agreed to. The customer agreed to the property walk document via email and asked when we would get started.

We offered and agreed to a $7500 discount to account for mess from the first subcontractor with the deck and the driveway and to help soften any frustration the customer had. This was all agreed to in writing via text.

All the corrections were made, the job was materially complete and we were down to a final day of punch list items like caulk, paint and touch up. The customer became very upset and demanded a precise date of when the job would be finished. We explained that it was expected to rain for the next two weeks and we also had to coordinate the date with our second subcontractor's availability.

At this point, it was evident they had been very dissatisfied with us for months and so we offered an additional $2500 to cover the costs of the final days work it would take to complete the punch items. The customer agreed via text and we set a time to meet.

When I showed up at the agreed upon time, the customer yelled at me, refused to pay, and demanded a warranty and more materials. (I wrote an email that is saved in the Google folder with more details right after so I could remember). I did manage to also take some pictures of the project while I was there.

Customer refused to pay. We are worried about whether they will come after us if the manufacturer warranty for James Hardie is somehow voided particularly the color warranty since we had to do touch ups.

I have a Google Drive with all the documents and text log.

We have but we just want to be done with this guy.

Ohio.

There's not much. After the contract we modified over text with two discounts the last one being to walk away.

I just want to do a walk away and avoid any conflict with this person.

Ok thanks.

The person emailed us today, they threw me off the property last Tuesday, they texted us last Friday and called last Friday and I can't talk to my lawyer till Friday. Is it too long to not respond till Friday or Saturday?

When they called I said I wasn't comfortable saying anything last Friday. We did not respond to the texts last Friday and Saturday. They sent the email today and we didn't respond. Is it acceptable to wait that long to respond?

I haven't sent the walk away.

I'm going to say I got your message and am reviewing it and then talk to the lawyer Friday.

No this was helpful.