Please take your phone back!

On 03.08.15 I went to the MTN store at Clearwater Mall to renew my contract and get a new phone. I was assisted by Mubanga who said to me he'd email my new contract the next day as it was close to closing time. Till today, I still haven't received the said contract.<br> Once I was home, my cellphone was activated and I could make calls. However, I couldnt sms and my internet connection is restricted to when I'm within a wi-fi connection. I have called the 808 call centre a number of times and they keep telling me there's nothing wrong I should reboot the phone. <br> I took the phone back to MTN on Monday and after waiting 45 minutes for them to fiddle with it, i was assured it was sorted I should give it 2-24 hours.<br> 24 hours later I still had no joy and when I went back to MTN in the evening the store was closed for stocktaking. <br> 48 hours later I still don't have a fully functioning phone. <br> I'm tired of using a phone that is half functional. I want MTN to take it back, cancel my contract and I'll look for an alternative mobile provider who will take my problem seriously and give me a phone that actually does what I pay for it to do.