It is possible to cancel the bonus after it has been activated in your account.
The cancellation can be done through the following path: In the upper right corner of the site, click on the arrow next to the icon with your initials of your name and surname and click on "My account".
You will be directed to the "Wallet" menu. Below your balance, you will see the option for "Bonuses".
Clicking on it will open the area where you can see all the information regarding active bonuses. If you want to cancel, simply click on “Cancel Bonus” and confirm your cancellation.