thumping noise in rear

I am a very unhappy customer. Not trustworthy will not bring my car back to Clarks. I Brought my car in for a thumping noise in the rear and was told that the mechanic improvised a fix on the spare tire carrier. I took it for a test ride and the thumping noise was still there. I was told by the service writer to bring it in to a Mitsubishi dealer. Clarks service writer was going to charge me $60.00 for repair that was not done. I did bring it to Salt Lake MITSUBISHI and the service department had a quick fix,left rear wheel was loose and about to fall off.Clarks service lost a customer....