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There is no way of getting your free lives back kfed525. King make it a policy that once a timed booster starts running it can't be stopped. The Claim button is mostly redundant as in the majority of cases the feature that displays a Claim button always starts without you needing to press the Claim button.
Timed Boosters and Claim buttons are some of the most complained about features of the game, but I guess King aren't interested as we have been providing feedback on these issues for years.