Poor customer service & debit orders from RCS when account is paid.

I've had money debited from my account for months now, even though I believe my account to be fully paid. The only problem is that I cannot check this to understand what this amount is for because: 1) The call centre never answers the phone (I've tried on weekdays and weekends) 2) I've had the call put down on me when they do (this has happened to me twice) 3) The RCS website doesn't even load, it just times out 4) And I can't check my account via Coricraft https://rcs.co.za/partner/coricraft/self-service/dashboard because it's linked to my old number and I am not sure how to update it without having to call a call centre that never take my calls.

Please can someone help me by telling me 1) What the debit order is for? 2) Why I'm paying this money to RCS 3) How I can stop these payments