>but if it's something new what can you do apart from not return?
Not returning is what you can do.
I'm not saying it's not annoying. I'm saying lumping it with telemarketing is different. Telemarketing is annoying even when you do nothing. Whereas with these popups, if you do nothing, you will not get the popups.
The popups are not invading your space. You are going to their space.