Air Conditioning Repair.

I took my car in to perform an A/C repair about a month ago; first I took the car in to get diagnosed and the owner confirmed my car needed a new A/C compressor, I proceeded to purchase a brand new compressor from Amazon and received it within two days. I proceeded to take my car to the shop with the new A/C compressor and it took them an entire Saturday and Sunday to replace the compressor. When I picked up the car, it was not cooling at even near 50% capacity therefore I demanded an answer, the techs said "you have to consider you do not have a new car therefore it will never cool like it should", I responded by saying "my car has always cooled very well prior to breaking down, but now it doesn't work like it should", they recommended I purchase two additional parts (which did not cost more than about $60) in order to make it cool the way it should. After leaving my car for entire Saturday the second time around, car came out of the shop cooling the same way I took it in to then break a day later and only push HOT air, not even same air temperature from outside but hot air. I contacted them one last time and they said they would not be responsible for A/C not working properly, even after following their advise as to what parts were needed to fix the car. Stay away from these thieves, I paid a total sum of $400 which obviously went down the drain.