Nef, I'm sorry you have to go through this. I'm about a year into a situation in the same ballpark and it will wear you down psychologically. Laws are not always great. I don't have great advice for blocking apps but ensure, in the meantime, you and your family document everything..screenshots of calls, strange numbers etc. And the less you engage the better. Sending a letter like Cindy posted is good in that it shows clearly you've asked the contact to stop (if you ever end up in court) but the lawyer should know the best advice. I've become an expert in Canadian stalking laws and eventually did have to change my number and will likely move this spring. Pm me if you ever need to talk.