Still waiting for response

I have tried to contact Vodacom by phone and had no joy, have been sending 8 emails for a response and had to verify my details twice as the time frame of 48 hours has expired so how bad can their service be. The second verification is again nearly expiring. An amount of R11 000 was debited to my account for a 3G data card for September that is hugely out of line with the average being used on this card. No phone call or SMS from Vodacom to indicate that this 3G card is running way above the contract of 2 Gig. There was no change in behavior from the user and as this is a personal 3G not business related and the user is working every day of the week from 6H00 in the morning till 16h00 in the evening this amount seems to be excessive. My request to investigate this amount is not being responded to other than email saying that this request has now been sent to the relevant department. Seeing that they have already received their money they are taking their time but I want a solution and will cancel all my contracts with VODACOM as soon as possible as they are overcharging people and there are numerous complaints about this excessive charging from Vodacom.