Non Existing Escrow Account Used To Pay Property Taxes

I had paid my property taxes directly to the county for my home as had been arranged in my mortgage and without my knowledge or permission Flagstar Bank set up and withdrew from an excrow account in my name that same property tax which I had already paid.

I could not get anyone to talk with me about this and now they want me to repay them the money that they claim to have sent out and the county claims that they did not receive a payment from them.