"Get well done" is a versatile phrase than can be used in many situations, such as:
1. Wishing a get well soon
2. An adjective/verb; such as when you are DONE.
3. Good luck and Happiness
1. I heard you got sick yesterday, I wish you get well done soon!
2. I didn't study for the test at all. I am about to GET WELL DONE.
3. Get well done!