Telkom *****ing my money

Why is it IMPOSSIBLE to sort out my Telkom LTE account (internet). I contracted for a capped package at R369/month. They continue to debit my account for much more - R872 then R854 then R874 and so we carry in. I have been to a store four times now. Every time they lig a new complaint with a new ref number,. No feedback, nothing. I called six times to speak to a consultant - phone eventually answered in twi cases only. Also no luck. The website and Apo don’t work. And so I could carry on. I’m desperate.