Information on a debtor's rights when a creditor tries to collect money after a discharge is entered is available at the following link under the heading "May the debtor pay a discharged debt after the bankruptcy case has been concluded?:"

www.uscourts.gov/FederalCourts/Bankruptcy/BankruptcyBasics/DischargeInBankruptcy.aspx

You are strongly encouraged to contact a bankruptcy attorney if a creditor is seeking to collect on a discharged debt.