Bad service at mtn festival mall.

On Thursday the 3rd of September 2015 I went to Mtn in festival to report a phone,which I bought 5 months ago, to report that it just went silent. It wasn't charging or switching on. The phone is on contract, and it should be fixed under warranty because the warranty period hasn't ended. I was helped by Ntombi and she told me that to bring the phone back the following day because it didn't have all the things it came with in the box. When I got there the filling day I was helped by another person, her name is Tshidi. She told me a whole different story which I wasn't happy about. She told me that the warranty period was over because the phone was already six months on the4th of September. I didn't understand that because I bought the phone on the 4th of April this year,so according to my calculation its only been 5months since I had the phone. She(Tshidi) and her manager said that they start counting a month on the day that you buy the phone. Its totally ridiculous!