Hope this never happens again, but

[chels]

From your description, the call was made on players outside
the paint, foul line extended on the opposite side from
the trail(you) coming at the lead.
If you were in your position near your sideline it sounds
like you followed the play too long.
I usually let the play go once the ball has moved past
the top of the key down towards the lead and concentrate on
the players on my side in case of a quick cut to the middle
and a pass.
However,I dont see how there could have been a block call
when you plainly saw the dribbler push off.
Oh well, good luck in the season.