MTN SERVICE STINKS!!!!

I bought a Nokia Asha 210 more than a year ago but was still using my old cellphone , so over the weekend I decided to download internet and whatsapp settings only to find out it doesn't allow it and the phone freezes every time I try. so I went to a franchise branch in Kenilworth in capetown where a lady told me that when these nokia asha's came out there was a fault on the phones she called it a warranty excessment and that I needed to get a new phone as my contract has not expired yet but she said because they a franchise I must go to another branch. So I went to another MTN branch in westgate mall mitchells plain where a very unreliable lady told me another story that I have to contact Nokia and sort it out with them. But I told her I took the contract out with MTN why cant they sort out the problem for me and she just insisted I call. So I called Nokia no answer. I feel like stopping my payments till someone at MTN can assist me and ill also be lodging complaint with the consumer protector I have had endless problems with MTN!!!