Amp repair disaster

I had a faulty amp and my son took it to this guy Craig on 22 June 2018. I had to pay R490 upfront for part that he said needed to be replaced which was the power supply. Today 15 August 2018 I still have'nt received my amp. I followed up weekly either by phone or to pop in at his shop. Every week it was a different excuse why not fixed yet. This morning when I expressed my unhappiness about his poor service over the phone this guy was so rude, unprofessional and sarcastic I could not believe he is a business man! The result I still don't have my amp and he cares little.