I was contacted by email and I called them and was informed a tax agent was looking into the expenses as they where high for my industry. Looking back I had over claimed by mistake. They paid a rebate into my account. I have no issue paying back anything that's over paid. What I'm worried about if there's any penalties I'll have to pay ie fines or if it'll affect my Visa in any way. I'm not sure the best way to handle it.