No invoice received but they deduct debit order!

MTN usually send me my invoice on the 14th or 15th of every month. When, by the 25th, I have still not received my invoice I called them to query this and was informed that they have \issues"with their billing system and cannot send invoices yet.<br> <br> In spite of their invoicing issues and my invoice now being almost two weeks late they happily deducted a debit order off my account last night. It appears their only issue is telling customers why they take money and how much they will take"