Have a sign in board on your club tolet others know where ( waht section of area, etc.) you are hunting.
What the other club member did was wrong to a point? Unless he violated some game regulations as mouthcaller has indicated.
Was your blind visible from where they shot? If so they are totaly in the wrong - if not and your decoys were hidden - you didn't help yourself much. Unlike deer hunting fully enclosed camoed blinds do not need to be brushed in ever.
Just my suggestion - glad yo where safe.
And I do agree with mouthcaller's other written suggestions too! Get the rest of the club involved.
JW