I would say Physiclly go there and talk to them. It doesn't cost much and at least you know they heard you. Just think, when you get mail that you don't need or want your throw it out. Same thing is going to happen.

If you start outlining your company you need to do it in a non-spam manor, because that will turn them off.

Personally I would rather either physically deliver the letter or physically talk to them. Either way it sets you out from the rest of the people trying to do the same thing.