How Do I BLOCK someone from sending me messages?

Been a member here for many years but this is the first time I've had this experience. Received a nasty message from someone I've never heard of or met and it appears that person is Banned but I cannot find a way to BLOCK him/her from my page.

Is there a way to block someone????

I'm not sure about BLOCKING, but you can add them to your IGNORE list by looking at their profile and selecting that option.