I find this story very difficult to believe. There's got to be more to it. If this AWD # is not valid in the US, why was it in their system and honored? When did they inform you, before or after the rental? You were banned for a lousy 5% discount? Nobody at Avis will talk to you or explain the violation? Perhaps you were "banned" because you are under 25, and Avis "banned" you until you meet their age requirement. Things have to make sense, and this does not.