How can I get my money refunded?

My wife went into a store the prior day. The following day I went into the store and the cashier approached me demanding money for items stolen by my wife the day before or she was calling the police. I paid the amount she said the items were worth. The next day I contact corporate and they start an investigation. When investigation was completed it was determined they made a mistake and there was no theft that has occurred. The cashier admitted she was wrong and she made a mistake. Now they refuse to return my money even when corporate said I would get it back. Now it's all over town that I had stolen from the store. It's very humiliating and embarrassing to go out in public now.