MTN *****ing our phone, two months without return

We handed in our IPhone 4 in order for MTN, who in the first place ********ly locked our phone/network, as it is not on contract anymore, to unlock the phone. We did this on 16/05/2015. Up to today we haven't received a phone call or heard anything and no one knows where our phone is. The IMEI number is ***.<br> I will make a case at the police against MTN for theft, as it has been two months and we are still waiting. If our phone is not unlocked, without any charges, and I don't receive a call by end of this week, I will go to the police and this is not an empty threat. I will also cancel all our contracts with MTN and go to Cell C.<br> My number is ***.