Incorrect Billing

My statement from MTN has been in a credit for almost 2 years. They deducted an amount off my bank account when my daughter had her own account created when she started working. They have to date been unable to provide an invoice for the amount that they deducted and the actual debit never appeared on my statement. Therefore they deducted (from my bank account) far more than my statement balance.<br> Now MTN works like this. Every month they deduct the amount of your invoice/s off your bank account. They do not deduct the amount of your statement total. Therefore, as they deducted an amount off my bank account for an invoice that did not appear on my statement from them, my account was thrown into a credit. Every month they deduct my invoice amount, not my statement amount. My statement is in a CREDIT and they should not be deducting anything until my account becomes a debit again.<br> NO-ONE at MTN understands accounting and therefore nobody will help me.<br> MTN - you are supposed to deduct the statement balance from my bank account - NOT the invoice amount. <br> MTN does not respond to my attempts to sort this out. I will cancel my debit order with them and pay them by EFT every month