I have directly reported a few of the many of these posts and communicated the hack through the provided contact feature.
If you click on their name, a profile box pops up, then click on ignore and their posts will disappear.
It’s the word Ignore, no button. Beneath the image the person has for their profile, there’s their name, below that status, gender & age… THEN, in a string, in blue Profile Page Start a Conversation Follow Ignore TAP Ignore