substantive salary mean
Yes
It means having weight or value. A substantive question is one of some importance, and a substantive response is one that contains some information and value.
I'm not telling you.
The substance of the law will be fair.
A court may rule that a law violates substantive due process if it infringes on fundamental rights such as the rights to privacy, liberty, and personal autonomy without a legitimate government interest. The law must also be found to be arbitrary, unreasonable, or oppressive in order to be considered a violation of substantive due process.
No
No, the courts have immunity from being sued. You may use denial of due process as grounds for appeal, but it may be difficult to demonstrate that a court "intentionally denied substantive due process," or that whatever wrong you believe was committed actually constitutes a denial of due process.
whether the law involve in a case is fair
That is the correct spelling of "substantive" (actual, valid).
substantive due process
You cannot "reverse" a case before it goes to court, because there is nothing yet to reverse. You probably mean can you get a case dismissed before it goes to court. The answer is Yes and that depends on the facts of the case and the law involved. It can be dismissed on substantive or procedural grounds. Dismissal on substantive grounds is usually done by summary judgment. This can occur if a court finds that under the law involved, even if the plaintiff proves his case, he still is not entitled to a judgment against the defendant. Dismissal on procedural grounds can occur when one or another party fails to do something the court rules require that party do, like providing discovery on time. A dismissal on substantive reasons acts like a final adjudication. The action may be appealed but not reinstated. An action dismissed on procedural grounds can be reinstated if the failure is corrected unless a statute of limitations prevents it.