Customer Service Experience

I took out a contract with MTN Online. There was no option to indicate that I would like to keep my current number. Upon receipt of phone I went to the store to The Grove store to get assistance with porting my number only to be informed it is not possible. I was told to visit the Menlyn store for assistance. The Menlyn store called the porting department and was told that the number I would like to keep (on a vodacom prepaid) can be swopped with the new contract number and that the porting department can assist. The store have been helping me with this. It's been 3 weeks and several calls to the porting department I my number still has not been swopped. Feeling frustrated with this process, endless store visits, phone calls and requests to porting department with no success.