That is so typical of the Witness mentality, it can't possibly be that much of a surprise. Although your letter was written well, wished them no ill-will, specified what you had found out about the Organization and even tried 'reasoning from the scriptures' with them, all they can see is: You are doubting God's Organization which equals apostasy, end of story. It's cases like this put on the internet that truly exposes how sick and evil the WTB&TS truly is.
The shock was that my only brother had made a special 900 mile round trip on the Friday to give evidence to the JC. He has always been a hardliner, currently a PO, but this was below the belt on so many levels...our house is less than a mile from the KH and he never knocked our door to see how we were or even to see his only two nephews...shame on him.
Yep. Something similar happened to a good friend of mine last year that I did a post about here: http://www.jehovahs-witness.com/6/123921/1.ashx