verticalresponse.com reputable mailing list marketing company or spamhaus?

A few years ago I bought a new PC from a large computer manufacturer and dutifully registered with them using a web interface and provided them with a particular email address so I could track who they sold it to. I own my own domain name and have it setup so anything(at)nozell.com gets forwarded to my default address.

So I've gotten tired getting junk mail to this particular account -- there are over 150 messages in just the first 20 days of October. Most of the messages have a message about click here to reply to this
message and be removed from the mailing list. The most common one from the href="http://www.verticalresponse.com">verticalresponse.com list. Since a lot of spammers use this trick to find 'live' email addresses, I was hesitant to remove the address that way. Since thier website looked reasonable and provided a phone number I called up on Friday (17-Oct-2002) and asked the nice woman on the phone to remove the email address. I told her how I track who sold my email and she had no idea how my email make it from the large computer manufacturer to their mailing list but assured me that she would take off the list. I mentioned that some of the email didn't have their removal notice and said that they just send out the email from lists provided by their
customers and the customers should always have the notice.

Well, it is the weekend and I'm still getting spam to that account, albiet none with the verticalresponse.com message. I'm wondering if verticalresponse.com is just feeding me a line or what. The companies still spamming me are: thesuperspecialsales.com, tremendousbuys.com, summertimedeals.com, greatoffrs.com (yes with the funky spelling), c0olmail.com (with the l33t spelling), and everydayoffers.com.

Here is what the junk box holds for that address:

 144     Oct 19 reply-34872443- ( 117) Check It Out Nortans Software!
 145     Oct 19 Tremendous Buys ( 316) Know what your family does online
 146     Oct 19 ScreenSaver     ( 198) Free Haunted House Screen Saver
 147     Oct 19 GreatDeals      (  81) Important Pet Halloween News
 148     Oct 19 Cool Mail       ( 792) Friend, Government Secured Certificates That Pay You 16%, 18%, up to 50%!!
 149     Oct 19 EveryDayOffers  (  38) Double your Download Speed and get Free Software
 150     Oct 19 Cool Mail       ( 792) Friend, Government Secured Certificates That Pay You 16%, 18%, up to 50%!!
 151     Oct 20 Tremendous Buys ( 198) For the Lip Plumper: Full Pouty Lips - A s Seen On NBC Today Show
 152     Oct 20 Kate            ( 218) Order Confirmation
 153     Oct 20 Super Best Deal ( 790) Friend, Government Secured Certificates That Pay You 16%, 18%, up to 50%!!
 154     Oct 20 Cool Mail       (  92) Friend, Printer Cartridges - Save up to 80% - Free Shipping Offer
 155     Oct 20 Cool Mail       (  92) Friend, Printer Cartridges - Save up to  80% - Free Shipping Offer
 156     Oct 21 The Super Speci (  73) Friend, Prescriptions with Privacy