I've tried business version of the soft and undestood that I don't need this functionality. What should be done in order not to receive bills in a future?
You just need to cancel your Todoist for Business account.
Thank you, Clyde.
But could you exemplify how to do it. Does canselation of Business account not harm the data of free account?
To cancel your Todoist for Business account, just simply follow these steps:
1. click on the gear in the upper right corner
2. select "Todoist Business Admin"
3. click on "Account and Billing"
4. click on "Cancel my account" in the upper right corner
And to answer your question, no data will be lost if you cancel your Business account. You will be simply reverted back to your old status which in your case is free. :-)