Strangest thing

[RoyalsCoach]

I am a basketball coach so I am not real familiar with volleyball rules. Long time fan because my daughters all played. This is a new one. Coach was trying to make a point for some reason and had a player serve the ball by kicking it over the net. Official immediately blew it dead and signaled by raising her palm up (lift?). Coach proceeded to argue that the serve was legal. Official held up a yellow card,followed a little later with a red card. Coach never left the floor. Is this serve legal? How many cards can a coach get?