AGREED ! YOU PAID FOR YOUR BALLS IN CREDITS, YOU SHOULD BE ALLOWED TO CHANGE THEM, CLUBS NO, BALLS YES !
You payed real money for a license of credits, and with that, you obtained a license of clubs and balls with the permission to use all of that at the discretion of WGT.
Read the T&Cs: They have all the rights to do whatever they want, we have none, except to decide whether to stay or to leave.
And, the bag is closed on the courses. Full stop!