MTN is a ****

On the 5th or 6th of August 2024 I ordered month to month Home internet router from MTN and they deducted the amount of R933.00 which is correct but then a day after they deducted another R933.00 from my account which I don’t understand because my next billing day is supposed to be the 5th of September 2024 and must be R500.00 On the 3rd of September they sent me a tax invoice saying that I owe them R1400.00 How come I only have a month with that home internet router but already am owing R1400.00 and I haven’t missed any payment. MTN is a total ****. I won’t pay that amount because I don’t owe you anything. I’d rather cancel that thing of yours if you think you will **** me am not a fool.