"Case closed" sounds odd to me. Perhaps they meant to say "a decision HAS been made, you'll have to wait until you get your letter to see what it says though."

If it was a denial, there is still the appeals process. If it was an approval, you are still subject to re-evaluations in the coming years.

It seems to me that a case shouldn't be 'closed' until you are deceased.

Maybe one of the posters who work in the field will have a more helpful answer for you.

Best of luck with this Val !