Fiancés ex

Ugh my fiancé’s ex fling continues to call his phone, 2,3 in the morning it rings and I’ll answer and she’ll be so rude. She calls and hangs up and when I call back she says “Wth I didn’t call stop calling me.” Like BITCH I have this number right here that you just called from and I’m calling it back, we block her number and she’ll use her friends phone or another number. I’m so tired of this thirsty fucking chick already. Or she’ll tweet “all I wanted was to talk to you, I can’t even get that.” NO she can’t wth does she need to talk to him for ? I’ve asked him if they have any unfinished conversations and he has nothing to say to her but she continues calling, can’t wait to change his phone number because it ridiculous, (they ended things when she fucked his bestfriend) so I don’t see what she needs from him now ? He’s happy. I’m so over this girl. Advice?

We are going to change his number very soon we have already gone but we hadn’t completely paid our phone line so they didn’t allow it, he doesn’t not answer her calls ever and it’s become so annoying. He does not want her in his life