Vodacom - excessive charges for unwanted data usa

I have had an on going problem with hugely excessive charges for data usage on my phone, data which I do not want, need, require or request. Despite almost daily calls to the call centre, my problem has not been resolved. I am promised call backs - this happened once, but I was unhappy with the unsatisfactory solution offered. I cannot get to speak to a person who has nay authority and consider the removal of funds - almost R20000 - from my account to be **********. <br> How can I get this resolved?<br> <br> Also, I do not receive my invoice or itemised billing unless I phone in and request it. Vodacom cannot/ will not resolve this tedious problem. This has been on going since January 2014, when I switched from postal invoices to email - supposedly for the convenience! Vodacom has simply washed its hands of the issue. <br> <br> Vodacom should know that dealing with the call centre is almost invariably frustrating and irritating.