If I could give the input of an outsider:
Apparently there was a communication error, Heroes wanted a rematch, now Wonwoks are offering it.
In the spirit of the tournament (which is to play Warband in a competitive enviroment and have fun), it would make the most sense to just play the match and have a good time.
Default wins/losses are of no benefit to the tournament, and I think that if both teams are capable of playing, and the match did not happen due to a communication error, the match should be replayed.