3 follow-up emails over 2 weeks, and the potential supervisor still wont respond to me?
I ignore such emails all the time. And I'd feel threatened/harassed if the email writer kept emailing me, contacted my students or postdocs, or showed up to my university.

The reason I ignore them is because there isn't much to say. I don't want to give you false hope because I can't guarantee your admission (even if you're the best one out of everyone who contacted me, there are plenty of strong applicants who don't contact anyone) and so, what could I possibly tell you? It might be nice to acknowledge the receipts of emails such as yours but I get hundreds of (mostly junk) emails and your email, being from an unknown sender, gets buried in the pile, and I usually just forget to reply.

So, stop stalking professors and focus on writing a good application and getting good grades. If you've emailed them once and if the email was good, they've read it and you've done your best. Any further communication will only lower their opinion of you.

EDIT: now that I re-read your post, I'm also noticing that your style of writing is quite familiar. This style comes across as immature at best, and entitled at its worst. For example, your spelling, grammar and punctuations are not quite correct. You're also narrating in a quite dramatic way, which is not how most academics write. If your email reflects the tone in which you wrote the above post and the subsequent comments, that may have had a hand in why your professor did not respond.