The French club have also announced their intention to appeal after Taia was found guilty of reckless striking with the shoulder at an RFL disciplinary tribunal.
The Dragons believe their player has been harshly treated in comparison to other incidents of a similar nature throughout the season.
Chairman Bernard Guasch said: "It's a scandal. We are not treated like any other club and there are double standards in the decisions of the RFL when it comes to our players or players from other English clubs. Why?"
Taia knocked out St Helens half-back Gareth O'Brien in a heavy and late challenge during last Saturday's Super League clash between the two sides in Perpignan.
Saints coach Nathan Brown was furious after the incident, describing the tackle as "disgraceful" and "appalling".
The controversial shoulder charge was banned at the start of the season and there have been a number of incidences of it before the disciplinary panel since.
The Dragons are angered that Taia's was rated as a grade C offence while others have been regarded at the lesser grades A or B and that some players have even been cleared.
The club listed a number of examples from recent months in a lengthy statement on their website, www.catalandragons.com.
Guasch added: "Enough is enough. We hold the evidence with the video footage and sanctions that have ensued.
"I warned that if the lack of consistency in the decisions of referees or disciplinary committee continued, I (would) ask the opinion of external people and media.
"I can't let go these differences of treatment which significantly disadvantage us compared to other clubs.
"We already have one knee on the ground because of our performances on the pitch, (and) the English are finishing by killing us.
"All the club, the directors, sponsors, supporters and above all the players, are already mentally weakened and resent a huge frustration, which leads me to ask the question where all this will lead our club, and why."
Dragons head coach Laurent Frayssinous agreed with the comments of his chairman.
Frayssinous said: "We are judged on comments and not on facts.
"Some Super League coaches afford to put pressure on the RFL and apparently, they are heard and decisions are always the consequences of their words.
"It's very frustrating to see that we are not judged in the same way on similar facts."
One of several examples cited by the Dragons was another tackle on O'Brien, in Saints' previous Super League game, by Wigan's Scott Taylor.
Taylor was not charged with an offence and even recent comments from Brown would appear to support the Dragons' argument.
Brown said: "When put in perspective I thought Scott Taylor's was worse than Zeb Taia's.
"Scott Taylor was from behind and was a deliberate shoulder charge. At least Zeb Taia's was front on and nearer a normal sort of tackle."
The Dragons have slipped to sixth in Super League after losing three of their last four games.
With an appeal pending and due to be heard on Thursday, the RFL has declined to comment on the Dragons' remarks.