Not Repairing Car Properly

Used Dealership 1.5 hours from home. Bought car cash at asking price. Drove off lot only to hear a noise coming from front right wheel. Took to 2 mechanics near home. Both stated control and thrust arms x2 needed to be replaced. Took back to dealers auto repair department that said only control arms needed to be fixed. Paid 677.34 for repair only to still have problem. Took back to mechanic near house who showed me that thrust arms are bad. Dealership took no responsibility. Repair will cost another $600. Very bad experience. Check used car dealers with the BBB. They got only a C- rating and are not registered with the BBB.This is probably why.