PATHETIC SERVICE

I bought a Pioneer amplifier in 2014 with an extended warranty. Unfortunately it happened that I had to return the item for a warranty repair in January. Three weeks later I received the item back, but not repaired correctly, so I had to send it back again. The invoice from the repairer was attached (approximately R1200 for the repair under warranty). Again I had to wait 3 more weeks for the repair and when I received it back it still was not repaired correctly. The new invoice from the repairer was attached again (approximately R1000 this time). Now its been 2 weeks since the amplifier has gone back. The manager, Thomas, did not believe that my claim was valid and I had to demonstrate the issue in store, displaying shocking product knowledge from the staff. Also the repair bills so far is R2200, and I paid R2800 for the product. The third repair bill will take it past the purchase price. Would it not make financial sense to just replace the item? In fact after all these repairs I think that it should be replaced. It has now been 8 weeks and counting without my amplifier. The service has been shocking to say the least.