Worst service ever!

My father bought a cell phone for my brother in your Breyten branch, within a month it gave him problems, we took it back in May on the 6th of May to be exact. We did not receive any feedback from Pep we had to keep going back to find out what was going on. Finally in the beginning of July we went back and they told us that He broke it and we asked that it must be sent back to us. They requested us to pay R270 so they can send it back to us. That fee did not make sense to me at all, but we paid it. Until now we have not received the phone or any communication from your store. Your store manager at Breyten told us that we must communicate with MTN but however, we did not buy the cell phone from MTN but we bought from Pep store. Totally unacceptable!!!!