Originally Posted by
twkidM3
....Where could I go to submit a complaint with Star Alliance regarding this issue?
Not an UA issue.
My first route would be to the airline operating the lounge.
There may be a path via *A, so I moved your thread to *A forum to see what input they can provide.
Does sound like it was badly handled but expecting great English among food court workers {likely min wage level} is probably unrealistic -- even in many domestic USA airports.