Mr Price not taking ownership

I opened an account in June 2018, bought A Hisense Cell phone that was suggested by the Salesman at the time. I used the Phone for 2 months and encountered problems, all my Apps stopped working, could nit make or receive calls not even able to load airtime or data. Took it back in September and was told it needs to be repaired, that takes 2 weeks. Got a call to collect the phone in September. And now the last week in January the same problem, made a call to the store (East Rand Mall) and was told again to bring it in for Repairs, what an inconvenience.At this point I can only use the phone to set my Alarm. I was told that the Cellular Network(MTN)must sort this out as they are only the Retailer selling on their behalf. I can not be contacted by anyone, not to think about an emergency.This is unacceptable on so many levels.