Cam and lifter replacement

1st, company communication is horible, no answer during working hours, mail box is full, no call backs etc. Because of lack of communication my car was in their shop for over 3 weeks. Sam the owner complained because I was calling to get a status on the repair every few days. He resented that and told me I was being a pain and if I did not stop calling he would roll my car out of his shop (with the engine taken apart). Frustrated, I held back knowing he could and I believe would hold my car hostage. I picked up the car on 4/27 at 3 pm. Immediately I noticed, the dash lights didn't work, the radio and map moniter did not work and the rear video camera did not work, to name a few. I went back and talked to the manager, Loui, he told me to bring it back in the morning, and they would fix it. When I brought it back, Sam the owner denied his repairs had anything to do with the problem and refused to do any repairs or even look at the problem. He claimed the problem pre-existed. I gave him a letter listing the issues. He smiled and ripped it up while stairing me down. This repair was over $6,000. All my claims are documented. I have had other issues with this shop. Use at your own risk.