I am sure rehabs and counselors speak to clients about this crap behavior... BUT your ex clearly thinks that he is not the problem... And I think there are way more therapists who are not capable of seeing through an addicts crap than there are ones who can... My x was fed all kinds of crap by his therapist (who he was conning like he does everyone) about how my setting boundaries was controlling him... He actually believed it so he felt entitled to continue to not respect any boundary I set.
Yours sounds similar. Since mine wouldn't listen to reason, I have had to come up with solutions to protect my kids and I and it sounds like you have realized you will have to do the same.
It's too bad your ex can't get it through his head that you want him to leave you the f*** alone... Since he can't stop calling, block him or if need be, change your number... It sucks that you have to do all this bc he won't leave you alone but if you get peace in the end, then it's worth it, right?