Mtn contract cancellation

Good day, I am not pleased at all. I called on the 28th Feb for an urgent cancellation of the Mtn contract which I initially called on the 7th Feb to cancel it the same day of the delivery and there were not updates regarding the cancellation and that’s why I had to call again on the 28th of Feb. Yesterday Mtn debited from my account for something that is cancelled and I reversed my money back. Now I called Mtn to inform them to stop debiting my money and they said I should call you guys so that you guys inform Mtn invoices to stop with the debit orders since the contract has ended. When I called you guys I was also told to call Mtn again because you guys can’t inform them. Now I called MTN again and they have sent an email to inform you guys regarding the invoices. Please sort this matter as soon as possible because I am exhausting of having to call you guys!