If the HELOC was included in the bankruptcy and was discharged therein, the bank cannot collect on it--no creditor may collect on a debt which was properly discharged in bankruptcy. If they just mean to send you certain notices, to ensure that both for internal (their own processes) and external (e.g. if some question later arises regarding foreclosure) purposes they can document having fulfilled their obligations, there is not necessarily any harm in it--though you might reply to notices in writing (some what you can prove delivery) with a letter indicating the debt was discharged and with proof of the discharge. However, simply being bureaucratic and building a complete file is one thing; trying to make you pay is another, and they may not actually collect or try to collect from you if the debt was discharged.