Help me kind gentlepersons!

[referee99]

ASA Slowpitch.
I'm PU. 2 outs, 2 strikes on batter.

Pitch is delivered, low but legal.
Batter takes pitch.
I call strike 3.

Batter and on-deck hitter start yelling that catcher said, "illegal" when pitch was in flight.
I have nothing. Didn't hear it. Ask partner, he has nothing.
3 outs. End of inning. Players on 'offended' side fuming.

Questions:
Had the catcher indeed yelled, called or said, "Illegal" in the situation described do we have anything? If so, what is remedy.

What are restrictions on catchers utterings? I have had sitches where teams are 'bothered' by a vocal catcher who is talking during pitches. "That's a good one, Charlie", etc.