Leave STBX ALONE. Quit intruding on his space. It gets you nowhere. The drama is not going to bring him back either. No reason to pull anymore stunts, they aren't going to work. Leave STBX ALONE.
I'm very worried that you are involved with someone else, already exclusively, while you are still unstable. I hope you'll consider working heavily in your al-anon group on the role of this new R in your life.
Al-anon seems to be a very positive force for you. Anything to do with STBX or his family seems toxic. Quit poisoning yourself.
"He doesn't call or email accept for business/kids." Good. But why are you offering anyting other than that?
"He has added her to his plan; I told them he no longer lives at this number and gave them his new contact info." Why? You don't need to manage this business for him, and it seems to have bothered you to do so. Simply say "wrong number, bye".
