If they can still see what I post, then blocking is not working as optimally as it could.
Blocking ends the harassement. Is working as optimally as it can. If you are screaming in a public space (because that's what a forum is, every body can enter and take a look) people around you will hear you, like it or not.
If you do not like how forums work, don't use forums. Is the best advice I can give you
still show up in my notifications,
Yeah already said that in the previous comment
(except for the already mentioned notifications that is either a bug or an overlook).