I'm sorry that you are having to endure this "nightmare."
You should contact the local law enforcement agency in which your employer is located. The facts, as stated in your post, my rise to the level of criminal behavior--possibly even a felony. You can ask to speak to a detective. You can present all of your evidence as to what your employer is doing, and failing to do regarding your child support. The police may perform an investigation. The police may then present the result of their investigation to the prosecuting attorney. The prosecuting attorney may authorize criminal charges against the owner and any employee involved in the fraudulent behavior.
You may also wish to contact the Attorney General's Office in Idaho. Below is a link to the website:
Further, you may wish to contact the Utah Child Support Enforcement Division. Below is a link to it's website.
You may also wish to contact the Idaho Department of Labor regarding the refusal of your employer to comply with the Utah Child Support Order. Below is a link to its website:
You may also wish to contact an attorney who specializes in family law in Utah in the county in which your child support order was entered. Sometimes, an initial telephone consultation is free or at a minimum charge. You can discuss the specific facts of your case, evaluate your options and decide how to proceed.
FInally, you may wish to contact an attorney who specializes in business law in your area in Idaho. Again, an initial consultation may be free or at a minimal charge. And, you may wish to contact the IRS regarding your employer's activity.
If your employer is refusing to comply with the child support order, as stated in your post, it is liable civilly and/or criminally.