Our reroofing is essentially done but a few things are still missing: connecting to roof to the pool cage, replacing a drain pipe they damaged, tightening some fasters of the gutters they unscrewed / removed, etc. They also cracked a part of the driveway by overloading a dumpster. During the re-roofing the contractor has lied to us on several accounts and is not trustworthy. They insist on payment in full before the will fix the last remaining issues. However, it seems quite clear they actually don't have the intention to do it. What is the best way to proceed? So far, we made it clear well pay the remaining amount (20%) only when the project is completed.