Ack, this thread kind of scares me! >_< I've never been scammed and I've only had good experiences here so far...but maybe I should be more careful?...sorry, but what's the wi-fi switch? You just turn off your wi-fi?
There's a switch on the side of your 3DS that turns off the wifi. Just flip that and it'll reset the town to the point where it saved before the multiplayer session started.