The balls have gone to your account, you showed the proof of receipt!
I see two possible scenarios:
1) These balls were identical to those you bought recently, so they probably went directly into your bag, adding to the number being there. As pointed out before, those balls need not to be equipped.
2) If you happened to play another type of ball then, you HAVE equipped those L87 TM Pro V1x balls in the meantime - no more action required.
Conclusion: WGT cannot help you because you need no help (at this point).
BOBBENCH052: They said i had to equip them via my phone
In general, you may change your bag's contents and equipment from both PC and mobile - it's one account. Whoever said this did not take your situation into account.
Case closed.