Don't fill out these forms unless they promise they won't give out your name. Reputable companies will tell you their policies up front. Don't complain about spam in newsgroups and on mailing lists. In many groups, it seems like there is more discussion about spam than about the group's main topic. Don't encourage flooding the spammer's mailbox.
Chances are they closed the account after they sent the mail.
They encourage responses via mail, fax or phone. If they closed the account, you'll get another message in your box saying the mail can't be delivered. Tell your congressperson that you object to spam and want to outlaw spam the same way that Federal law prohibits the sending of unsolicited faxes. Protect Your Company from Being Stalked, Conned or Blackmailed on the Web. He also delivers speeches and workshops at industry conferences.