Bart Foley
You could return the letter to the collection agency, ABANDONED PROPERTY, RETURN TO RIGHTFUL OWNER and / or SENDER. You have no valid contract with this firm. Or ask the question, can I use the surety of the person / legal entity I happen to have to pay this public debt? Or you could seek clarification from the sender that you received a bill of exchange and under the bill of exchange act 1882, they have an obligation to disclose all methods to you on how to pay it.