[tpdirorg]

Sorry to hear this...
But Google does this sometimes, and this is the answer they give to all people no matter what they did, or didnt do.
So only Google know why, but the thing is they closed ur account and it will stay closed.
For you peace of mind, in most cases its about invalid clicks ( you click your own ads, or someone that know ur site, and maybe wanted to help you make extra cash clicked you ads, or, you places ur ads in the wrong section or 2 many of them, there is strict rules wt where and ad can be placed and how many times, and places, if u placed it wrong, then, that is why)

Hope this helps
Regards