Vodacom overbilling

I have contacted the customer call line and engaged them three times today, they couldn't explain why I was overcharged.

I have not received an invoice. The only financial document I have is a quotation that was sent by Customer Service from Vodacom.

I was debited R5 293,73 instead of R1 408,99. The Customer Service attendant mentioned that the R5 293,73 includes cancellation fines. I did not cancel any contract with Vodacom. This is my first contract.

I want my money back in my account!