Incorrect billing

Worst service from Vodacom. I have called and emailed numerous times, requesting assistance regarding an incorrect statement/billing for the month of March. I have received read and delivery receipts for all emails sent but i have not received any response in 72 hours. <br> <br> I have been billed R933.26 for Data usage on Data contract *** on the 2015-03-18. i don't know how this can be, because i have a soft lock of R50, which will automatically lock the card for any usage. i used the card again on 2015-03-19 and nothing was charged. I checked the balance on the 3G card, and there was 39 MB left. So need someone to look into this matter urgently and rectify this with your highest priority.<br> <br>