WARRANTY ASSESSMENT GONE WRONG!!!

Very bad service from everyone I have spoken to inconection with my warranty assessment. Did an online upgrade, device ended up being faulty. Sent it in for warranty assessment. 4 weeks later and still no replacement phone. There is now a fight as to who must issue me with a new device. MTN staff don't know how there own system works, mangers are rude and unhelpful and not one single person I have spoken to during this process that has said they will get back to me has gotten back to me. I have had to phone them back to get a response. I AM SO CLOSE TO CANCELING THE CONTRACTS I HAVE WITH MTN!!!