Universal Air & Heat review: ac repair

They cam to my unit and told me that I needed a new pipe from the roof to my unit for 765. They inspected it and it only needed a pipe resoldered that took and hour and about 30 in parts. They still charged me 765...I contacted them. First they said it was becasue freon was 100 per lb. But my system takes puron at 5 per lb. Then they told me it took hours. But the camera on my doorbell says one hour...