This is what bothered me about the whole post. He never once said how old the other company is. A critical (purposeful?) omission.
Your post is now clearly shameful; the fact that you went even further and began accepting donation money only escalates that shamefulness. Did you really think that the details you left out wouldn't come to light?
You've handled this very poorly. Apologize to the community, apologize to WhosHere before you get smacked with a defamation suit, and hire a damned lawyer to deal with your legitimate trademark and breach of contract lawsuit in a court of law instead of wasting time dancing around in the court of public opinion.