Hi Max,
Whenever you buy new equipment like balls you'll need to equip them before you can use them. To equip your new balls just follow the steps below:
- Click PLAY NOW and load up the game client.
- Once loaded choose MY SETTINGS > MY EQUIPMENT.
- Click on the BALLS tab at the bottom.
- Select the newly purchased balls in the window and drag them to the ball slot in the "In My Bag" section.
- Click SAVE CHANGES