Do not why I was blocked

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yesterday I signed up with adsense and when I went back to log in I had a message saying I had been blocked from their site. I emailed them explaining that I was new and did not know what I had done. I received another email that was on the mean side saying yes I had been blocked and they would not discuss it any further. I still do not know what I did to get them in such a tither. From the way it sounds they are not going to tell me. I had hoped they would so I could make sure I did not do it again. Has this ever happened to any of you?