I signed up for R358 not R920!

Telkom I need urgent assistance coz just like everyone complaining I can't call your call center, lines are not going through. My contract with you is for R358. A deduction of R920 was taken! I've never missed my contractual payment. I want my money back! Who do I contact? Please get back to me. We are dealing with serious issues like Covid19, now we must run after you as well