Rather close your account 6 months ahead of schedule

We had a data contract with MTN for a number of years and got service as expected. Now and again went over the data allocation and paid the price for those...

But after phoning in to their Customer centre at the beginning of June 2017 to cancel the contract, it is now 4 months later and still no yet a fully resolved account . First call - asked to cancel as soon as possible. Ok, done. June and July 2017 - nil ZAR accounts, so all good. August, September - one high bill, then usual bill, so here we go. Called them end Sept, beginning of Oct, already 4~5 times now in November and still no trace of refund for the incorrect billing. And what is the most annoying point - every time we have to phone them to follow-up on their lack of progress.