My ex's employer will not follow the order of withholding for child support, I've sent letters, the court clerk has called them

I delivered the order in person, had the court fax a copy, court clerk spoke to them, sent letters demanding compliance before I go take them to court. Today I was notified they still will not obey. I have done my entire divorce and subsequent modification pro se. However, I am unable to find anything like this in all my research. I only find that in Texas Family Code, Title 5, Subtitle D, Chapter 234, § 158.210, section (a) 1 states the county is entitled to a $200 fine to employer for each occurrence, but that is of little help to me other than a threat to employer. Should I file a Motion for Enforcement of Order of Withholding and serve both my ex and his employer's registered agent? I am a bit lost and could use some direction. Thank you