Diappointed with upgrade dept - empty promises!

I recently upgraded my contract on my number *** with MTN , as a loyal customer for over 15 years the expereience with the upgrade dept has been somewhat ridiculous to say the least.

Firstly the upgrade is done by an external vendor and not directly by MTN, so it takes days before anyone calls you back and even when you call MTN they can assist you because the upgrade is not done by MTN so they transfer you to the external vendor which takes you 20mins before the call is dropped because they are not able to diretc your call to the relevant person who assisted wiht the upgrade. I upgraded around October and was promised a Voucher of R500 which to date I not received and then secondly I requested for an additional data package to be added to my contract which has not been done so I now find myself without data on a new contract.

I require a manager from MTN to intervene to ensure my data package is added and that the R500 voucher as per my upgrade package needs to be emailed to me to honour our agreement .