Radiator Repair

Put in to replace the leaking radiator, they gouged me $275.00 for the part which was $100.00 anywhere else and claimed they used an OEM part on a 12 yr old truck.($400.00 overall after they tried to charge me $900.00) REALLY??? Just over two years later it was leaking and needed to be replaced again. Initially they didn't want to (past warranty)but they gave one to the Wayne's garage (who charged me $1600.00 for changing the spark plugs-they broke one and that became MY fault & cost for a questionable top end job)but Wayne's got them to give up a cheap part. 2 yrs later it's leaking AGAIN. Can't find a decent mechanic in this town who isn't out to screw you over. HELP!