- Google-bomb them. If anyone searches for DirectAxis, the search results should point everywhere other than their cutesy website.
- Find out the CEO's cellphone number (for extra credit, his wife's also), and use that when signing in at building security desks. (I suspect that's one way the "databases" get your info.) Use it also when anyone "needs" your phone number. This is probably not legal, so don't do it.
- Weld their gates shut. Don't do this either!
- If they include business reply envelopes (I haven't even opened their crap, I should really check this out), cram it full of "valuable marketing material" and "business correspondence" you've received from other "respected vendors" (read: other junk mail), and pop it in the mail.
- Call them, and take as much of the call centre staff's time as you possibly can. If economic sadism is your thing, you'll enjoy it, meaning it would be a good use of your time, and the call will cost them (staff costs, opportunity costs, not so much call costs - you bear those) more than it costs you. Use it as practice for sarging women (as most of the pit crew seem to be). My record is 25 minutes on an incoming junk call.
I really should add a link to my FV / PV calculators to make this post more relevant to DirectAxis's business.