My bad Experience with Mtn

Hello P…On the 4th of September I took a month to month contract with MTN for home Wi-Fi which they are busy currently campaigning .I took the 499 Package for month because it was in the middle of the month I paid Pro-Rata for 348 plus 499 upfront payment for October. So on the same date MTN debited me 948 which the consultant told me that my next payment is gonna be end of October for November and if I’m not happy with the service provers I can just return their router at the next MTN store near me.To my shock today I receive a statement and invoice and MTN saying I’m owing 432.47 which I’m supposed to pay on the 4th of October. I then call MTN customer service and their consultant are failing to tell me what I’m being charged for cuz I have already paid for this month with my first debit order!To make the matter worse their Invoice and statement says I paid 948 on the 1st of October not September anymore .Is my first time receiving statement today by the way I never received it before .Someone pls Help.