<human>: Can you provide a brief rundown of the text in within 3 sentences?

Ok so my girlfriend started getting these calls from this unknown number, its a guy who told her that he found nudes of her with her cell number attached to them on the web. And realistically both me and my girlfriend are aware that nudes she may have sent to an ex may have been posted online, in todays day and age its more than possible..but anyways, he told her that he "did her a favor" and took them down (sure) and so he'd like her to do him a favor, then he proceeded to say a bunch of disgusting shit to her, of course she hung up but he wont stop calling, over and over and over again, she picked up one more time to tell him off and he told her that he knows where she lives. 

So my girlfriend called me from a landline and i told her to call virgin mobile (she has an iPhone) customer service in the morning to they could block the number (obvious thing to do) but as for notifying the police, how would something like that be done? just call them? go to a station? what would she have to say to them and what would even be done? We live in Canada, Ontario.

I am furious that someone would do this to the girl I love and I want to make sure she's safe and has peace of mine, i've never considered what to do in this kind of situation so any insight would be much appreciated guys.
<bot>: My girlfriend has been getting calls from some creep and we need to know how to block him and how to properly report this to the police so she'll NEVER hear from this guy again.