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Boosters are saved directly in your device's memory, which always allows you to use them while playing offline. This also means that if you delete and reinstall the game, then Boosters can be lost and just saved Levels.
It’s best not to store too many Boosters on your device, as there is a chance they may be lost, or affect the game play. and save your game in Facebook and King Account.
Please read links bellow about lose booster!
Or please report this to our Player Support Team here,
@Ayujeet Hi and welcome, As the boosters are stored on this device itself they can be lost for a few reasons, which sounds like this has happened to you. unfortunately these can not be recovered and only if you had any unused purchased boosters will customer support help with you these
Please email Player Support directly from the game.
When sending an email directly from the game, Player Support will automatically get your purchase history and all transactions the recent 90 days.
Go to the game's Start Menu, then Settings - Help Center - Purchases & Gold Bars - Contact us and send them an email
or alternatively you can use the contact us below but you need you game ID for this
Hope this helps