here is the situation, my brother used my dad's amex and he ended up trying to dispute just over $30,000. my dad did not know that my brother was doing this. to buy more time, my brother has been trying to dispute it again. now, my dad never signed a paper or confirmed that he accepted the charges, can he argue that against them? if so, what would happen to my brother? and they added on $11,000 for late payment since the charges were incurred january '06...please help.

