MTN billing is NONSENSE

If I could I would rate MTN -100. I opened up an contact/account with MTN in October and my first deduction was suppose to happen on the end of month October. I saw that no money was deducted and I called to inform them of this. Only to find to find out the debit order didn't approve. I've called multiple times to rectify it but no one is able to help me. They on promising me that the billing team will call. MTN is at fault