You are disputing the charge because it is a BRG, yet you didn't tell them it's a BRG. Seemed to me like Chase assumes that you were double charged and that's why you are reluctant to send them the statement
Incorrect.
A. Friend was there when I checked into hotel
B. My card wouldn't go through so after having the desk agent promise him the room was already payed for, friend gave cc for incidentals
C. Friend got charged for full amount of room
D. Friend disputed charge and Chase asked for proof that room was originally payed for