Please, remember that after purchasing any event purchase offer, you need to activate it in-game.  Go to in-game store and scroll down until each corresponding section (for example, just above the gems purchases to activate the boosters). 
If you still cannot see it, please, contact our support team following these instructions:
Tap on the in-game settings button and then open a FAQ that could help you in the game. On the bottom of the screen, press "NO" and then "Contact us". Don't forget to explain your case.