Contract cancellations

I have been incorrectly billed by Vodacom , once I realised this I contacted vodacom on the 8th of may 2018 , where I was tranferred from one person to another and some of the consultants would end my calls and ignore me.I asked to speak to the Manager for Accounts - queries and the person I spoke to refused and said that i am not allowed to communicate with the manager either via a phone call or email. I then sent an email to this email addresses: ********** ********** & ********** no one rep**** to me. Retentions department said that they cannot cancel the contract , I have to speak to Accounts , I have been pushed from one person to another.This is very annoying i must say .Today I phoned Retentions and spoke to Wilson who resfused to give me the email address or direct line of his manager , He also refused to send me the confirmation of resolving the query once He gets whatever he needed from accounts , Said He will send an SMS with reference of what He did on the system and He still have not received it. I have been on the phone today with Vodacom since 11.05 until 11.50 when my call was actually ingored where i spoke to a lady that decided to put my call on the survey mode without even assisting me. i wonder if Accounts department - billing even exist at Vodacom ,because no one is willing to communicate. My subscription with vodacom was initially R99.00 and to my suprise! i see a bill of R724. and some odd cents.What the hell happened here?