I've had enough of Mtn!

This is the worst service I've received thus far from Mtn. I've been a Mtn customer for years. And on the 31st October I did an upgrade with the rentensions department. My devices were delivered and I then queried about my promotional data that I never received the query was excalated and I received a portion of my promonal data. I then called in again and they excalated the query for a second time. I received an sms stating that the query has been resolved and when I checked my account balance I've still not received my data. I queried about my R500 Samsung voucher that suppose to come with the device and no one at Mtn customer service is able to help me with regards to this. It's now almost two weeks later I still haven't received my full promotional data or the R500 voucher that comes with my contract deal. And no one is able to provide me with proper information, instead they transfer me from one department to the next. This kind is service is pathetic!