INCORRECT BILLING AND INSTALLMENT DATES

Dstv keeps billing me incorrectly everytime I login to the app, they keep changing the installment dates as well and I already paid! They overcharging me and disconnecting my decoders. When I make payments they reflect and can't reconnect because the amounts keep changing and say I need to pay more. Dstv charges me twice the amount for one month after making payments imagine, everytime I call I keep talking to different consultants who escalate the issue to the Accounts department or the "Team leader" (the accounts department either don't know what they are doing or are ******** people to pay double what they already paid) fix my account and reconnect my dstv!!!!