netmeg - 5:58 pm on Nov 6, 2012 (gmt 0)
I have never heard of a situation where there was no email whatsoever, so if you haven't found it in your spam folder, I dunno what to tell you.
Unfortunately it doesn't matter whether or not you've made changes - possibly Google has, or possibly they see something wrong with your traffic. The policy violation could actually be happening outside your site, and not generated by you. They'll even disable accounts for a potential of significant risk that hasn't occurred yet.
The bottom line for Google is, the advertisers have to be protected at all costs, even if that is at the cost of a long term publisher who never knowingly or unknowingly did anything wrong.
The only other thing I can suggest is to go over to the Google AdSense forum, and see if you can convince a top contributor over there to flag your account for review. It helps not to be antagonistic (FWIW) even though you naturally feel so.
AdSense is what it is. The publishers don't drive the bus here. The advertisers do.