Vodacom keeps billing me for someone else's acc!!!

I had a cooperate phone, the company gave me an allowance and transferred my account to another user, as the administrator for our company with Vodacom I sent through the request to migrate the account rename it and remove my split billing to the main account, they confirmed done, however I was debited from my personal account one month for access usage, i reversed the debit order and stopped it on my expense and emailed our account managers Janet and Rooksana, they forward the email to someone to attend to but nothing was done, this morning again another R1600 was debited from my personal account resulting in my vehicle finance debit order bouncing, if I had money for lawers I'd sue Vodacom for the flippen inconvenience. Something must be done about this I've just had it!