if you don't pay the fine... or if you simply try and ignore this.... you can never go to the states again. unless you want to become familiar with the inside of a U.S. jail.
While a completely different scenario, I bought something several years ago, in the U.S.. I shipped it home to myself at the start of my vacation, only to have it siezed by U.S. customs before i had returned to Canada. When I got to the border.... before i even got in the canadian customs line up.... 3 state trooper cars and a ATF vehicle were waiting for me..... for a 50.00 item that I had no idea was not allowed to be exported from the U.S. without appropriate paperwork. I spent 2 days in a U.S. holding cell before my legal representative was even able to contact me. In the end, I got a stern warning, a 500.00 fine and was released to the canadian authorities.... without charges i might add. I can freely travel to the U.S.
My advice.... don't dick around, don't look for answers here, find counsel on this situation and tread carefully..... unless you want a permanent ban on travelling to or flying over the U.S.
In these days of U.S. paranoia.... anything could happen at this point, Hopefully you get a good judge at the hearing and one who doesn't see you as a potential Osama binfisherman