1. A bit of Google-searching suggests that you're in Australia. I couldn't find any U.S. trademark registration for $NAME, where your .com domain is $NAME.com as listed on (what I surmise is) your Twitter header.
2. If the facts are only as you say — always a big "if" — the letter you describe would be ... let's just say, groundless, at least in the U.S.
3. If you own $NAME.com; AND: For seven-plus years you've actually been using $NAME as a trademark "in commerce" in the U.S. by shipping goods bearing the mark (or rendering services under the mark) in interstate- or foreign commerce; AND: You're being threatened with a U.S. trademark registration, AND: The registration hasn't been made "incontestable" by the passage of five unopposed years; THEN: In theory you could petition the U.S. Patent and Trademark Office (USPTO) to cancel the other company's registration, on grounds that you're the senior user. That would not be cheap, and I think this would require hiring a lawyer to represent you in the USPTO. https://www.uspto.gov/trademarks/ttab/initiating-new-proceed...
4. You might find amusing the precedents at https://www.oncontracts.com/monster-cables-picked-the-wrong-... (response to a threatening letter from Monster Cable) and https://lettersofnote.com/2011/02/14/regarding-your-stupid-c... ("some asshole is signing your name to stupid letters"). In a similar vein, one of my late former law partners reputedly had a big BULLSHIT rubber stamp that he would supposedly apply to such letters and return them to the sender. (I don't remember ever seeing the stamp so it might have been a story that "evolved" over time.)
5. The title/headings that you list are mostly gorilla dust that unsophisticated lawyers throw up to try to get opposing parties to agree. There's no way you'd want to agree to all, or even most, of that without a BIG, buyout-type payday in return.
Again, don't rely on the above as legal advice; when in doubt, consult a lawyer who's licensed in the relevant jurisdiction.
EDIT: If you want, email me (see my HN profile); if this is a U.S. matter and it's not from one of my existing clients (extremely unlikely), maybe I can write and send an "appropriate" email response for a purely-nominal fee (but I wouldn't be able to take on anything more than that).
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