MTN POOR SERVICE

I have received a very poor customer service, beginning of July I upgraded my contract at Ladysmith branch told the consultant that my pay date is the 15th, I don’t know where she got the 21st- on the 15th I paid via app R2000, I told the consultant to cancel the debit order, boom on the 24th they decided to deduct R1500 on my account without my consent, I phoned the 135 number to initiate a refund but I was told it will take 7 to 14 days i requested to be transferred on the senior person, they took my details and promised that someone will phone me no one has phoned me from yesterday, I reached out to Ladysmith branch I was told that they can’t proceed with my refund theirs a system error the lady will check with her seniors- 7 hours later there’s no response. I need my money for urgent things but MTN is failing me