Billing issues

I've been trying to resolve my account since July 2021 with no luck. I've witten letters, called, went to the Vodacom shops to find out why my bill went from R868 to R4 700. No one can give me an answer. No one can give me an account breakdown or give me a detailed statement. Is this not their responsibility? They dont want to give you a reference number when you call, they avoid it or cut you off or they promise to send a proper breakdown and never send it. They have listed me now on itc and all of a sudden my account is R20k, still no one can tell me why. To date I've made uncoubtable calls, when it gets to the core detail there is a glitch or they just drop the call or all of a sudden there is a voice prompt insisting to do a voice verification which is faulty so I'm forced to drop the call on my side. I see this as *****. They force you to pay whatever amount they feel otherwise they list you on itc. I don't have open lines, I didn't request any additions to my existing contract so please Vodacom tell your customers why they should pay a bill 4 x what it should be. I've been declined for my house bond now because of this. Or are you just going to bully me to settle so I can clear my name without any information why its R20 000? How is it possible that you cant tell me what I'm being billed for and such a hectic amount which I'm sure all your customers would have queried if it was them. Is it not my right then to decline a debit order if I dont get a statement or answer why it is so high?