You're altering the facts to suit your argument. If that's what you want to do, then you can be correct, because I can change my answer to suit whatever facts you present.
For example, if you characterize the employer's actions as forcing you to accept health insurace rather than the wage equivalent, then that would be the tort of conversion, and you could sue the employer for damages, due to the theft.
However, previously you described facts that suggest you have been subjected to a pay cut of $3.00 per hour -- and there's nothing unlawful about that. If you continue to work, then you are consenting to the pay cut.
Texas is an "at will" employment jurisdiction, and under that well-established doctrine, an employer or employee can alter or terminate the employment relationship at any time and for any reason -- or for no reason at all. See Montgomery County Hosp. Dist. v. Brown, 965 S.W.2d 501, 502 (Tex. 1998).
Thus, your employer can cut your pay at any time and your only recourse is to quit your job.
Re your "signed contract." A written statement that you do not want insurance, under the "at will" doctrine, applies only as long as each party to the contract agrees to continue the employment relationship unchanged. As soon as someone wants to change the deal, they can, and as soon as they do, if the other party continues to work or employ, the deal is confirmed as changed.
I know that you are certain that the employer must be violating some law. I can tell you that in Texas, an employer can successfully fire an employee, even though the employee was being asked to violate a criminal law, unless the employee can prove that the termination was for the sole reason of refusing to violate the law. This means, that if the employer had any other reason for terminating the employee, that it could use that reason in combination with the fact that the employee refused to violate the law, and thereby fire the employee. See Sabine Pilot Services Inc v. Hauck, 687 S.W.2d 733, 735 (Tex. 1985).
The point I'm trying to make here is that the employment relationship has always heavily favor employers in Texas, and there appears to be no end in sight. So, while you may want to believe that you are being wronged, that wrong is not necessarily illegal.
The law does not right all wrongs. It just maintains order among members of society.