Am I in the wrong?

My ex-husband and I have been doing visitation exchanging for the past 7 years every other weekend. I received a call from Child Support where they have been attempting to collect a payment for 26 months now from dad and they don’t pbtain any answer. His driver’s license has now been revoked due to lack of payments. He swears that I am being dramatic for not allowing my son to go with him while he is driving without an active license when my son is with him. I am afraid for my sons safety while he goes over! For God’s sake, Am I exaggerating?