I think you are skating on thin ice with respect to any legal action, and your interpretation of recording someone's phone conversation without their express permission is shaky. My advice is to simply move on. If you are concerned about the process they outlined to you, consider this:
You heard, second hand, that you were not disfellowshipped but somehow "removed." I have found over three decades as a dub that even long-time JWs do not fully grasp the organizational language and often misinterpret the standard buzz words. Based on the conversation you relayed to us, it's my opinion that your letter to the elders containing various 'restrictions' on any meeting with them was viewed as a letter of Disassociation. Therefore, they could announce that you were "no longer one of" at the next meeting and not even inform you of it, since they already had it in writing from you.
That's how they'd testify in court and would be upheld. That how it would be reported in the news, if the newspaper even got that far.