keberoxu, it sounds as if you have good strategies still in place for dealing with all of this, but my heart goes out to you as it must be depressing, stressful and exhausting.

It's good that you avoid all direct contact.

I can see your viewpoint about not changing your telephone number, but if this were me, I'd have to take some action about the unwanted calls, as it would make me very jumpy every time the phone rang.
Is there not a blocking system you could use? (We have one here in UK, with BT, and one can nominate numbers which are not acceptable. BT then blocks them for you) I understand you feel this would give them some satisfaction, but your peace of mind is important too.

You sound strong and sensible, and I admire you for it.