Billing error

I have the compact package, I've been paying my account every month but for the past 6 weeks my account has been on R3000, then R1800 now R2300 which is so odd!! Consultant's reconnect me after I explain the situation, but every Monday I have to call in as it gets cut every week, using so much of airtime for the past 6 weeks as they said it's an error and that they would remove the error from account. I am sick and tired I'd rather choose something else than Dstv!!!! Please fix this. Call me on ***