Then email them directly with the evidence, ask them to cease and desist. Email as many folks in the company as you can. Maybe a little peer pressure internally will make them reconsider.
Finally, use text that only applies to your site in some way. In other words, make it so that if they copy you, it will be obvious to the web surfing public who is the Wannabe and who is the real deal.
This can make you better! Really!
Thanks to everybody who replied with constructive advice.
Homebrew I think you have confused the issue with McDonalds/Burger King there is no problem establishing competing businesses as it encourages competition and gives consumers a wider choice.A problem would arise if I were to copy McDonalds advertising/sales literature I would then be on the recieving end of an extremely expensive lawsuit.
Whether you like it or not copying another advertisment is theft of their intellectual property to justify this because it is business is a little naive.