MTN is *******

Account no BA***. I have cancelled my data contract on 06 July 2020, which is a month before the contract end date of 05 August 2020. MTN requires that you inform them a month in advance and that is what I did. I have received an sms on 06 July 2020 saying that the contract was set to be cancelled on 06 August 2020. I have proof of this. My normal contract amount was R359 per month.The way the way the July billing was done I could see I am paying 25/31 days till 05 august the contract rate, and from 06 to 11 august out of contract rate. The calculations are on the july statement and that is where it would stop. If the contract was supposedly not cancelled according to MTN, why did I not received my monthly data on 12 August? The bill at the end of August was R1300.99 . (normal bill R359+R332). How did you get to this calculation. Please note that I am reversing the debit order of R1300.99. MTN . I have 1 contract of R288.69 p.m and that is what I am going to pay as at 31 August. The staff is ***********,