I wouldn't suggest blocking the phone # if you are still married, but if and when you aren't, then block away.
You can avoid that R talk by simply going NC for a few (or a lot of) days. Or at a minimum stop answering most calls. Answer occasionally. Don't respond to all texts. Don't respond to texts that aren't a question.
H 34 W 29 BD 3/12/18 Divorce Busted Spring 19
It is not things that bother us, but the stories we tell ourselves about things.