Hey @Sunia41581 - thanks for posting your question, and welcome to the community! 

At this time, we don't have a blocklist feature that will stop invitees from booking with you. That said, we’ve taken serious measures on the back end to mitigate spam events and abusive tactics and are always looking into more ways to prevent unwanted meetings. These measures include:
 

• Improvements to reduce spam, including suspension of fraudulent accounts, preventing automated account creation, bot detection on our bookings, and–soon to come–invitee booking limits and blocklisting 
• Hiring an entire team dedicated to Abuse, Trust & Safety, which is constantly working on evolving our abuse detection and response tools -
• Maintaining an internal monitoring tool that detects and blocks spam messages generated from Calendly before they get sent. It does not catch everything, but it lowers how much spam gets out -
• On-call teams that respond to Terms of Use violations and suspend bad accounts as soon as they are detected

If any event winds up on your Calendly that shouldn’t have, you can click the Report this event link either on the email notification you receive for the event or in the Scheduled Events tab in Calendly, as shown in the screenshot below. This cancels the meeting and reports the data to us, so we can continue to improve our abuse prevention measures:

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Please note: Reporting an event does not block that invitee from booking with you in the future. However, it does add the invitee's email address to our logs which are being closely monitored by our Product team for future improvements around the issue of undesirable bookings.

This topic offers some work around ideas on how to better control who books with you: 

Let us know if that helps and if you have questions! =)