Somebody abusing your ads... doesn't mean an immediate ban. If you're worried, email Google and notify them that you think this is suspicious, and that you don't know why it's happening.
how google check your impressions and clicks? does google check it on your daily report (empression / clicks etc) or monthly?
For your tranquility, send Google Adsense an email. At the least they know you are a responsible person.
sounds really fishing lawrenz that you can have 1000 impressions and 1500 clicks...you are going to get banned.....
Since AdWords advertisers' stats don't update clicks in synch with impressions, I assume AdSense stats work the same way.