PATHETIC SERVICE BY MTN

I was contacted by a representative of MTN in September and offered a free migration to a higher data package. I was told that I would only be charge R99.00 extra per month. To date I haven’t received the extra data I agreed to and nobody at MTN seems to be able to assist. I've made over 15 calls to their customer care line but they have no idea as to how to go about resolving the issue. To add more misery on top of the pathetic service delivery. MTN decided to debit my account for R500.00 extra this month and I was told that I would have to wait 14 to 21 days to get my money back. I've sent numerous emails to the customer care address as well as the social media sites but no one at MTN seems to respond. TWO MONTHS to solve a simple migration and double debiting my account??? I will not be renewing any of my contracts with MTN.