****** and debited twice different amounts

I have mobile contract and I use debit order to pay my bill. I have been debited twice this month. I went to query, was told it's not been updated was promised to get phone call but nothing. When I called 081180 choose right options i end up not going through any consultant. When I press the option for the billing it will beep when it suppose to say the amount that was debited and only gives me the amount due for the next bill. I have cancelled the debit order and this is not the first time. I dont recommend Telkom to anyone.