7-Eleven

I purchased a Coke Cola, snickers, and gas from the local 7 Eleven totalling $33.24 and they actually debited $833.24 from my account. This is no joke. They have admitted it was a system error but have I gotten a refund yet. As of today, NO! 7 Eleven has promised a refund but will not tell me when I would get my money back. They have also stated that this has happened to other customer's as well. I have filed complaints with corporate 7 Eleven and have only gotten apologies and have recieved nothing for the inconvenience. Now I am blogging about this issue to avoid legal action. I have also filed a dispute with my bank but since the amount was indeed debited out of my account the dispute may take a while unless i receive my refund from the gas station. The first thing is what can you purchase from a gas station for $833.24? Second how can a gas station or company just take money out of your account and then just give it back when they feel like it. This was a prepaid transaction done inside of the store for $33.24. It has now been over a week and I still do not have my money back and bills are past due. What should I do now?