Bad service

My line has been suspended because according to MTN I am in arrears. I have tried countless times to get assistance from the customer service but with no success. I was invoiced on the 12 of August to make payment of R438.96 before the 2 September.

I made payment of R440 on the 1 September using ref ***. My line has been suspended the whole month and I'm told I have to pay an additional R328. This is so irritating and an inconvenience because I have been paying every month and now this.