Incorrect Invoice

I have upgrade my phone to a new contact so the first thing i do was to check my first invoice.<br> <br> I have seen that my invoice is not correct, so i call and got a ref number 124 942 639 so that they can correct this because the discounts is not on.<br> <br> I told them that t hey have ample time to correct my invoice and not to correct this in the next month. All i want is them to debit my account with the correct amount only and not the incorrect amount. <br> Know they say they want to put me on the cash amount, etc. and i must pay at the bank but all i want is to be charged for the correct amount this amount on my debit order, why cant they just debit my account with the correct amount????<br> <br> I think it is because MTN might have a cash flow problems because that's the only reason i think that someone will perform this form of actions. Why cant they just do as i want and deduct the correct amount or am i a bank for them to quick and no cost cash.<br> <br>