Someone suggested on another thread to buy a fiverr gig and blast lol......... don't, there is another similar thread here and about this, authority sites behave differently when blasted regardless of the anchor and methods.It may work once in a blue moon, I'd prefer to use techniques that work most of the time. Look for other authority sites and pages just below and seo them with optimized anchored, varied but keyword rich. Proper neg seo needs some thought and planning when you're dealing with authority sites. Blasting can work on normal non authority websites , done properly. I'm not a fan of neg seo and anyone using it just because they are clueless about seo and want a competitor downed is a scumbag, it is that simple.
Anyway OP, in this instance , mickeyfu's advice is probably all you need , if the post genuinely has your address and other personal information on it it will be easy to have it removed, by law, in most countries you have some privacy protection and if they fail to removed it I would threaten legal action, indeed I would take it if they failed to remove it.