Prescription doesn't apply if the debtor acknowledges a debt or makes any payment towards the debt as that would interrupt the prescription. The OP would need to provide details of how long ago they paid the account, when it was settled, on what basis it was settled and when the new account was opened and if any correspondence or communication regarding the old account has been made since and also what period these new charges relate to. Also, if there was any condition relating to the pre-occupation as part of the offer to purchase.