Business ProfileforD&J Carpentry

DandJ Carpentry were hired to do a job for us. They asked a 40,000$ installment payment for an estimated 57,000$ job; we paid. Down the road they asked for an additional almost 13,000$ and threatened us to leave with all material, if we don't pay immediately. We did. Now they still haven't finished their job, over 2 month after estimated date of completion and are asking almost about 16.000$ extra. Even so they didn't provide a proper and detailed invoice. They also billed things that were not agreed on and they billed tools for example as screws or other material. We are asking them to fix the issues and damage they have done and to correct the invoice, but they are threatening us with forwarding the invoice to a collection agency. They sent us a final bill, withdrawing from the contract but still refuse to send a final and corrected, detailed invoice, including copies of invoices from third parties. We received their wrong and incomplete invoice on Thursday, Nov 02, evening. We addressed our side in an 11 pages email-attachment. They didn't reply but sent another incomplete invoice on Friday. We asked again for clarification on different matters. Sunday they sent us another email, demanding payment arrangements made until Tuesday or they will forward whatever they are asking to a collecting agency. They claim we are not willing to pay, but that is not correct. We just don't want to pay for things that are not ours, damaged products and time needed to fix some of their damages. We calculated roughly 24.000$ in false claims, over damaged products and things that they are accountable for, time spend on repairs of their mistakes, damage to our property, faulty work, not finishing the job, double billing, etc. This is an amount, that we question and we can't get DandJ to respond to this. We are wondering if they can send this off to an agency, also there are false claims in the invoice. We are willing to solve the issue and we are willing to pay, the correct amount.