Welcome to the Q&A Forum

My rankings dropped as well, although we got a relevant link from bbc (linked with only the url)... I didn't see any positive impact on that yet.

It is a  very small world in a lot of business niches.  Always assume that your boss knows your competitor. Also, unless you are the owner of the company you should never make a threat or send a nasty email to anyone.  Tell your boss about the problem and let him/her do that dirty work.  That's what bosses are for (I am a boss so I can say that with confidence.) Nevertheless... if this person is getting away with using your homepage content he might also be using your product page content, images and who knows what else. I would be on the lookout for other infringements and if I found them I would (in this instance) gently inform my boss about duplicate content problems that might arise and losses in your corporate advantage related to infringement. Be ready to give a very short and very convincing statement about why this is an important issue.  You have seen how they behaved in this situation.  There could be strong relationships between the companies and your company could be on the advantageous side of them. Good luck.  Be careful.

It is in Albany, NY