Overcharged on billing

Overcharged by over R3700 on my Vodacom Bill. First lost a gig in less than a day and was told I was on the \internet\" then received a bill for over r3700 after loading one gig. Service is pathetic. Can't wait for end of contract. Was told by the call center now that i have been charged for a new line that I don't have and additional bandwidth of over r2000. Was told they could not escalate as they are working on a new system and that I need to query the upgrade with the store that did my upgrade. "