Vodacom Incorrect Billing

In November 2018 I change my previous company's cellphone contract over to my personal account in order to keep the number. seeing that it was already due for an upgrade I requested to change it to data bundle package only and I will load airtime as and when required. In December I was billed for some entertainment services (Invoice B ********** 35) and after a 17 min call to the customer services I was ensured they will correct this error. Vodacom claimed that I might have activated something, but to load airtime I need to provide banking details and pass certain security questions??????? Even to ask a question pertaining your account you need to pass at least 5 security questions, but to activate untraceable services is simple!!! I again followed this up with Vodacom Mokopane on 9 January 2019 after it was not corrected in my January bill, again I was transferred to the customer services, again I had to pass numerous security questions, again Vodacom assured me they will follow up and to keep me updated, again I received NO feedback.