Yes, you can generally decline gifts received through Throne if the gift isn't something you want, as Throne allows you to cancel gifts or return unwanted items after you receive them. You can also contact Throne support if a gift was purchased incorrectly or if you need assistance with returns. 
For Gifts on Your Wishlist 
Decline it: If the gift suggestion is something you don't want, you can decline it.

Straight from google.