bad service

i took out a contract with Telkom Mobile in Jan, i received my device and sim, i wanted to change the contract number to my existing number, which i went to the store on 3 feb to do so. the lady at the store was unable to assist, so she logged a called and promised that someone will get back to me within 72 hours, it is now 2 weeks and no one has gotten back to me, i have being calling the call centre from Monday and everyone is saying they are escalating the call and someone will get back to me, but no one is assisting. this is costing my extra as i am paying for the contract but no able to use the sim card.

please can someone get back to me, it is as simple as a number change!! why does it have to take forever!

thanks