If yes, what was the reason?
This never happened to me per say. Like I would find any reason to talk to the guy I liked. But I would tell him I couldn't give him my number because my phone was off. Which sometimes is true at the time. But it wasn't a problem because I would see him a lot at school and stuff.
You cannot undo this action. The opinion owner is going to be notified and earn 7 XPER points.