Congrads Almighty - tearing up the letter and walking out - a totally awesome moment
What's even more hilarious is their perception of your actions
I just love it
Take some time to decide your next move.
Without getting into a long story, I can tell you that if you hold your ground and insist that you just "don't feel comfortable" talking about it (your views or situation), they don't seem to go further. In my case I even went as far as telling quite a few elders from different congregations I disagreed, and "had issues" with the society, but that I just "didn't feel comfortable" discussing them. I'm sure that there was debat on what to do, but nothing was done, time has gone by, and I disappeared. I recently went to a JW funeral dressed in sports jacket - no tie (just so there would be no illusions I was coming back). I was ignored by many in the congregation but actually well-treated by the long-time elders and Bethel visitors, who have no illusions about my state of mind (A), I'm sure.
Perhaps in your case you feel more comfortable DAing. That's your decision. You know the drill
All the best to you. Keep us posted.