Data Billing Uncapped *******

I have contacted Vodacom in connection with my 1gig account (R99 a month, which I had specified to be capped) several times now, over the period of July/August I have recieved a total deduction of over R8000 off my account! First of all I cannot believe how incredibly rude the last guy Mark was to me, I do understand that Data was used to my knowledge or not, but besides the point this contract is supposed to be capped, if it was i would not have been in this mess! Do you just randomly decide when to uncap? How can you justify deducting an extra 8000+ rand for 4gigs from me off a contract that costs R99? Or do you just not care because it is a debit order? I am incredibly disappointed in the way Vodacom has handled a cutomer of 10+ years. You have given other customers once off good standings before, but not me because I am a debit customer and you already have my money, at this rate you won't have to worry about this customer for much longer.