fruad on account

vodacom is a horrible service provider. last month I got debited R615 instead of R75 for my 1gig data contract. when I enquired was told I had upgraded on line an got an I phone. WHICH I NEVER DID. was promised an enquiry was lodged with the ***** department, and I will hear from vodacom in 7days,after 9days still no news. when I call they request another 7 days. they expect me to sit and wait for days so I can hear how they *****d up an I must pay for their inefficiency because they continue to debit my account for services never rendered. how is it my financial responsibility when vodacom and their employees did not ensure the identity of the person upgrading, how do I even know If its not 1 of them that committed the *****,****seeeeed beyond measure