My account charge double

Vodacom is giving me the poor service.. On my Monday i phone regarding my cellphone account charge double and the log a call and receive ref number.. Some call me and say he will cancel the charge and my account will get back to normal and show correct balance.. He closed the ref.. Nothing change lies to customer thats very disaster service and I'm not going to pay anything until my account fix you can disconnect or do whatever.. STOP DELIVERING BAD SERVICE TO CUSTOMERS.. When i call call centre their busy dropping calls No one is coming back to me... If your system make error its not customer problem you need to fix it