My 2nd mortgage was discharge thru a chapter 7 bankruptcy. Do I need to make any voluntary payment?

Send them a copy of the chapter 7 discharge and any orders stripping the 2nd mortgage of secured status and request that they stop sending you notices. You need not personnally liable for any voluntary payments. You should check your credit report to make sure the loan is properly being reported as discharged in bankrupcty (or similar). Usually there is a lag in getting the write-off accomplished and after that is done the notices should stop.