Quaisee- You may want to seek legal counsel, as stated before. One thing that seems strange to me, however, is that a home typically cannot change hands without having a clear title, and HOA fees show up as a lien against your property. I would question them as to how the home changed to the new owner without the bank clearing up the past due HOA fees. Every transaction I have had, whether from the bank as seller, or representing a buyer, has had the HOA fees paid by the foreclosing bank. I'm not sure you owe the money, and would do some serious investigation before agreeing to pay anything. Perhaps you can contact the agent that had the listing as ask them if the HOA fees were paid. It would be in their file.
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