MTN WITHOLDS REFUND FOR 9 MONTHS

MTN failed to cancel this sim only deal in March 2020, in April 2020 I emailed customer service to see why the debit was still going off, and I emailed Lebogang Dube who advised that the system was offline and they were struggling to cancel the sim. After a month of struggling Lebogang assured me that I won't pay a cancellation fee (I have this on email) as MTN was offline and is at fault. The contract finally cancelled on the 31st August 2020 and MTN has charged me for the cancellation fee, and was still charging the full debit order every month - 5 months after I initially tried to cancel the contract. It has now been 9 MONTHS AND I AM STILL STRUGGLING TO GET THE REFUND for the incorrectly charged debit orders and cancelation fee. I have got SO MANY contact peoples details and reference numbers, they just keep telling me that my query is being dealt with.WHEN??????