There is a huge difference between having a clunky pay system prone to "occasional" errors that they "fix when pointed out" etc and having a manager in a boardroom saying they're intentionally keeping a difficult system in place to short pilots, telling pay specialists to deny legitimate claims in hopes a pilot takes it at face value, etc.
If there was anything solid enough, ALPA would've already filed a lawsuit. I'm sure their lawyers have looked at this situation and determined wage theft to be a weak case. Ask your reps.
What we can do is to skip the courts and demand the next contract put pay penalties in place if a pilot gets shorted, a crew assist comes back wrong, or something along those lines.