How does blocking work in Messenger?
Change platform:Computer Help
When you block messages and calls from someone’s Facebook profile or Instagram account, they'll no longer be able to contact you (example: send you messages, call you) on Messenger or Facebook chat. You can also ignore a conversation, turn off notifications for a conversation, or delete a conversation.
How do I block messages and calls from someone on Messenger?
What happens when I block messages and calls from someone while I’m using Messenger?