Cannot make outgoing calls - for more than 2months

Good day<br> <br> I still can't make any outgoing calls after more than 2 months since my contract upgrade.<br> <br> I've been to the mtn customer care centre and called in to the mtn call centre to have this resolved numerous times. Each time I was ensured this would be fixed - to no avail.<br> <br> If this carries on I will be forced to return the phone and have the contract cancelled both at mtn's expense.<br> <br> I cannot continue like this any longer, this has become beyond frustrating.<br> <br> Please resolve asap!<br> <br> Thank you.