Old ac compressor leaked freon so bad it wasn't us...

Old ac compressor leaked freon so bad it wasn't useable. New one from RA installed and ran great for 4 hours until the clutch failed. Can't get warranty, can't talk to anyone. This has been a poor experience and not worth the little savings if you have a problem. Won't order from them again. Was told can not get warranty because I did not change expansion valve and drier but the old compressor still worked but it leaked freon bad. It did not implode requiring the condensor etc. changes. compressor still works but clutch is dead.