Refund and not aut****d to debit.

I am beyond frustrated with the lack of service from MTN. A person phones the call centre, but problem just never gets resolved. I have phoned their call centre on numerous occasions to get this matter resolved without any success. I have been told 3 different stories about the money that must be refunded, firstly I was told it will take 3 – 5 working days, then when no refund was done, phoned again, was told that payment will be made within 48 hours, still no payment made. When I phoned this morning, I was told that it will take 21 working days. How unprofessional of such a big company. Still my money has not been refunded. I have provided MTN with the proof of payment of the October payment of R329. My account was double debited end of November and then an additional payment was requested on the 1 December 2020 without my consent. I urgently request that you refund me x2 R329 that is in credit on your side. You were not authorised to debit these amounts.