Please stop this Building Opportunities automatic posts on my account immediately! I don't want this

I didn't sign-up for this I thought it's a internal job posting or some kind of internal refferal opportunities, I already have 5k+ connection why do I have to post about Preplaced now when I haven't got a single opportunity from preplaced,within just 8 mins of post up I just lost 32 connections I don't want this on top of that Preplaced posting from my account for there promotion how do I stop this