They're showing in your inventory. It looks like you only need to equip the new items.
To select and equip new virtual golf clubs and balls in the game, follow these steps:
1) Select the MY EQUIPMENT option after purchase, or on the My Profile page, or in the Game Menu
2) Click and Drag the new club or ball from your INVENTORY to IN MY BAG
3) Click the SAVE CHANGES button
_CHAMPION