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I worked for a large corporation, I left that corporation on good terms. About 2 months after I left the company I received an email saying that I have been over paid for two weeks worth of salary they also sent me a breakdown of my payments for the last year. Personally I don't see this over-payment they keep telling me because my check before the over-payment was $0 then the next pay period I received the amount I expected as final pay. It makes no sense that I would received over-payment after this. I think they shorted me on my check before the payment, and I have asked them why. Now they are bugging me to pay back money. The company sent me a letter in the mail about the over-payment with one amount in the letter but in emails I have gotten 2 different amounts.
I am not sure of the right way to address this problem. How can I properly respond to their demands to pay back money that I do not believe is over-payment?