Edward - I'm sorry to hear you had such a bad experience. Unfortunately, this forum is made up of Amtrak passengers and a few crew members who like to discuss trains, so your message won't get passed along. (Do consider joining, though, since you ride Amtrak frequently!)
I would recommend calling Amtrak Customer Relations at 1-800-USA-RAIL. You may have to leave a message or wait for an official response, but several people on this forum have had good luck and even received small travel vouchers as compensation. Be sure to let them know your travel date, your train number, and a description of the conductor so they can determine who was assigned to that car.
If you'd rather send a letter, you can mail it to:
Amtrak Office of Customer Relations
60 Massachusetts Ave. NE
Washington, DC 20002
I suggest calling, though, since it can take several weeks for them to process your letter and send you a response. Some people send email, but most of them are told to call the toll-free number. The number really is the best way to go.