change of ownership

I did a change of ownership at vodacom chats store in woodmead retail park. Every single time I phone the call center I am told I am not the account holder yet they are fine to debit the money from my account every month. I was told that my i.d number during security validation is incorrect and I need to visit a store and do change of ownership. I have done this 2 times. and now Vodacom call center have told me again that it has not been done . I cannot be expected to go in store again for a third time. either this is resolved or I just put a stop on the debit order being deducted everyone month. this needs to be resolved urgently