Unless the rule has changed this season, the first reply by Kevin Smyth is right - the ref issued a yellow, so there's no comeback, there would have been if he had said he didn't see the incident.

Anyway, if Wolves took things further and demanded that the incident be seen as something like bringing the game into disrepute, they should be concerned if there is an equivalent to the "frivolous appeal" rule whereby players given red cards have their bans increased for ridiculous appeals against their suspension - maybe they could be docked a point or two?