If that happend to me (In Canada situation) I would take whoevers phone who's doing that and tell them " 7 Days '' in the most evilist and quiest voice i can make. (Altough im not sure if its 3 or 7 days)
There was this one time where my sister was babysitting me and my friends and she kept doing that with her boyfriend over and over again. I was so feed up with it so I took her phone from her told her boyfriend to go f*%& himself and broke her phone.
I was grounded for a month. At least she stop doing that B.S. with her boyfriend. I lied they still do it, it wasn't worth it at all!