My 2 cent!
When I signed up with SIC back in 2000, my account also got frozen. I called them up and they told me the reason, my ratios were WAY WAY below average and something looked suspicous. I gave them the keywords/phrases where the SE traffic came from. They verified it, matched it up with the URL where the signups came from and couple of hours later everything was back to normal.
SIC's good in my book
