Too many calendars created by mistake

How can I delete all the calendars and start fresh again? My problem was that the Monday booking did not show up. Then I tried several times. I did not know, that every time I change something on the timetable, that it creates a new calendar…
Can someone please reset my status or tell me how to get back to square 1?
Thanks very much

Free accounts can only check 1 calendar for availability under the Calendar & teams section. Your account is checking 4. I’ve reset that for you to only check 1 calendar now.

Thanks very much. Does this mean that I can only set up times once ? In case I would like to change sth. - is this automatically a second calendar?

You can only check one calendar on the free account and have only one booking link. You can change your availability as often as you need to.