I was looking at my reports for today like an hour ago... and suddenly I saw something strange. It seems that I got 5 impressions and 3 clicks on a channel that I'm not using for like weeks now... Anyone can please explain/guess what can cause this? I'm sure that this channel's code isn't showing on any of my pages, so how can this be? I've also reported this to adsense, do you think I should have or it wasn't really necessary? If it was, when do you think they'll get back to me? Do you think this might risk my adsense account? Thanks all for your answers.
I think if you really don't click your Ads you should not worry about that. Somebody also put their adsense IDs to templates and send them to other people. In that case, you can not keep tract your earning from expected channels.
either you have some old pages where you still have the channel ad or have content distributed with your adsense code from where you are getting the impressions