It’s so very sad but true that not every kid gets the family that she deserves. You certainly didn’t. You were living under constant threat of sexual abuse. In a twisted way, it may be that your father did you a favor throwing you out of the house. He may have known at least on an unconscious level that he could no longer control his impulses to try to have sex with you.
Please give yourself lots of credit for having the resiliency and strength of character to survive and thrive in spite of such a rough beginning. I hope you have surrounded yourself with a “framily” — friends who have become a family that loves and supports you.
Unfortunately, there is no way to “make” your uncle stop contacting you unless he has done things that are serious enough to warrant a restraining order. What you can do is learn not to let it bother you.
As you rightly point out, you don’t know these people. You don’t owe them anything. They weren’t there for you when you were growing up and they have nothing to offer you now. You have every right to ignore their attempts at contact. You needn’t feel guilty about not responding. Being angry gives them more energy than they deserve.
Treat messages from them just like you treat “junk mail.” Toss it out and forget it. Focus on the people in your life who matter, not those who don’t.
I wish you well.