Cadillac

Hello I have 1993 Sixty Special Cadillac with about 85,000 miles and Bought it New at your Lampasas, Texas Dealer They have always serviced the Car per schedule ,.. Recently i notice unuasl noice and took in the Car and they told me that the Compressor has internal damages and need replacement. Told them to order the part and call me to have work done.. They called and I took the car and thenthey tell me they cannot do the service because my system is R12 feron system and the have no recovery system for it..Then they say the compressor they order wont work with R134a or what ever new system is reguired.I fail to seewhy they wouldnt have told me years back when the systyem went obsolete that I needed to replaced it. We have bought this car in good faith and now i am stuck with a car that will quick when the system shuts down and I will not be able to fix it. This is my 5th Cadillac and sure dont want a millstone around my neck because of failure to keep me protect by the dealer.. Do I have to throw my Cadillac away because of this service. If so that pretty expense piece of Junk