Unable to resolve inquiry of unfounded charge

Re: S3-85V36-6ZR0V ***~CMUP<br> I cancelled my data contract with Vodacom and requested the number to be transferred to Pre-paid. The month after my contract cancellation Vodacom debited my account with R3034.30 on 04/05/2015. I have been sending emails to Vodacom customer care and keep getting a response apologizing and promising feedback within 24-48 hours. When this period expires and I follow-up again (3 times now already) I am repeatedly being asked to first submit security questions because the \96 hour time frame"has passed .... who's fault is this? After submitting my request to have this corrected 05/08/2015 nothing has been done. I am in the USA currently and difficult access to my accounts. Please could someone in Vodacom correct their mistake and respond?<br> """