Why was my account deleted?

I didnt do ANYTHING wrong. All i did last night was work on getting more points by giving long answers. I was on a role. I had -102 points and i got it down to -34... That is fricken bullcrap. I was a top contributor and everything... Was was my account just erased? I can't sign in and i know the info and when i was online: it kept telling me to join...