Still not being charged the correct amount

Dear MTN,<br> <br> After my last complaint I was told my issue would be resolved. This was the 18th of February.<br> <br> My previous post: \I upgraded my MTN contract in October 2015. My previous contract I used to pay R250 and should now be paying R550, but I did not pay this amount yet. I have been trying the last 3 weeks to get MTN to take the correct amount but it seems impossible. I am trying to avoid back billing because I know in a years time when they wake up it will all be deducted at once. Please help me pay you!!!\"<br> <br> MTN's reply \"Thank you for your post.<br> <br> We are terribly sorry for the inconvenience that you experienced as a result of this. We completely understand the frustration it has caused. <br> <br> Kindly be advised that a request has been logged with technical support to correct the package on your account, REQ:***.<br> <br> Rest assured, it is not our intention to displease you. We look forward to improving on the service delivery to you.\"<br> <br> The issue is still not resolved, please fix this. If not fixed I will assume the correct amount is deducted."