Worst service from Rewardsco and no help from MTN

I upgraded my MTN contract with Rewardsco on the 17th of August and today the 27th of November I still did not receive my device and am being charged for the updated contract. I have made numerous calls to them and have been promised to be sorted out so many times and during my last call the manager even promised to refund the fees I have already paid in respect of the new contract. i was asked to send an email to Miranda with my statements and she has never responded even to my follow up messages. Not even MTN can has helped, all they have done is just refer me back to them.