Burrow Roofing and General Construction

They put a nail through the copper AC line in the attic. Owner doesn't deny they did it but said it's not his responsibility to fix.
We purchased our home in December the inspection on the home went great but the roof needed to be replaced. The previous homeowners insurance paid for the replacement. It was almost $12,000. When we went to use the AC this weekend it wasn't blowing cold air. We then contacted commercial services heat and air and they came out to charge it. The unit leaked all Freon in 15 seconds and the said there had to be a leak. They searched the unit itself and didn't find a leak- we told them about the roof being replaced so they instantly went to the attic and found the nail through the copper line. I contacted the roofers and was called back by the owner and he said that he doesn't deny that they put the nail through it but that it's not his responsibility to fix it. He also stated that he's been through this with 3 other homeowners and has been as far as litigation to prove it's not his responsibility that it's whoever installed the AC. The AC company (as well as my husband who was a HVAC journeyman for over 10 years in the state of Oklahoma-where this house is) said that it is installed to code.