NATS only expires a member when a biller tells it to. Members that show up as Expired or Canceled in a biller, but not in NATS, indicate the biller didn't successfully tell NATS that that member expired or canceled. If this happens, make sure polls are working correctly. Also double check your biller's account info.
If you need help, please put a ticket in our system and one of our techs will help you.