Just had all my boosters zeroed out after another CC game update. There has been answers suggesting

igormcsoccerface

Hey developers...support your product...replenish boosters when YOUR updates wipe them out...get a clue that your customers actually earn these boosters by playing YOUR game and have a right to play booster as WE want...NOT YOU.

_Elsa_

Hi igormcsoccerface, sorry for the delay in responding but thank you for writing us here at King Care. Are you still having this issue? Do you still need help?  Unfortunately, when playing the game on a mobile device any crash, any Android updates or game updates can cause you to lose your boosters and lives.  This happens because they are only saved on your device so that you can play the game offline.  

I am going to give you a link to a form that you can complete and if you say pretty please perhaps they can offer you some boosters:  https://care.king.com/en/contact