Can you get your rook re pierced after it was rejected?

It's not common for a properly done Rook piercing to reject. Due to this piercing being done in deep cartilage, the piercing should not reject (the cartilage won't let it reject). More often that not the problem is the method used to look after the piercing or the solutions used to heal the piercing (generally too much and not properly rinsed out).

I would suggest you seek the expert advice of your local professional body piercer. They would need to see what you have going on with the piercing location. If there is enough tissue that isn't damaged they should be able to repierce the area.