Failure to reimburse an incorrect charge

I watched a movie at The Grove on Saturday 05 December and purchased a meal combo at the till. I paid for the meal with my card, but the system did not register that the payment had gone through. I tried again and the same thing happened. The lady at the till told me that the transaction was not successful, so I paid in cash.<br> <br> However, the payments both went off my account and I contacted the customer care email, which put me through to Mary, the manager at The Grove. Over the course of two months, I have provided her with proof of incorrect charges, banking details etc., all with promises to reimburse me. This occurred up until the 6th of January, after which she just ignored my emails and requests for feedback (as well as requests from the customer care email which I had cc'd)<br> <br> I am tired of empty promises and just want my refund.