Expiring Norwegian credits

Recommend getting refunds when you can. I have had 2 cruises booked and cancelled using a combination of future cruise credits and cruise next credits and Norwegian refuses to extend the expiry dates on both. Do not want to book and get cancelled again or go to the dwindling ports that will allow cruises. If i lose any of my credits, over 900 dollars, I will never cruise with them again and tell everyone that will listen. Too bad since I did enjoy their ships prior to Covid.