money is taken out my son check for child support, child support said they are not receiving payments, what can he do,he is being threatened by child

If there is only one child support order regarding your son, then you should contact the child support enforcement unit by phone to see where the issue is.  You may need to fax over to them copies of the child support order and copies of the pay stubs showing that the money is being taken out already from his paycheck.