Phone stopped working after 5 days.

Purchased a new Blackberry Z10 at Foschini Gateway Mall, Durban. After 5 days the phone stopped working and would not switch on. As it was on a Friday evening, I returned the phone on Monday since I work near the mall but do not live near it. I was told that the 7 days return had expired on the Sunday and they will have to repair the phone. I told the lady that the phone stopped working on Friday and they can check when they are able to get it on when it was last used. The store manager was also very rude and abrupt. They told me I they will send it back to MTN and I would have feedback within 5 days as well as a phone. It has now been ten days and still no feedback. I emailed the Foschini complaints department and got a reply asking for the store number and my details 5 days ago. I sent all the information and have not received any feedback from them either. I have emailed them numerous times since then and still nothing. I went to the store again and still no feedback.<br> <br> This is probably the worst service I have ever received!