Instead of filing a credit card dispute please go to PACER.gov for more information. Or, call their phone number 800-676-6856.
PACER bills quarterly.
Usage Jan-Mar is billed in early May.
Usage Apr-Jun is billed in early August.
Usage Jul-Sep is billed in early November.
Usage Oct-Dec is billed in early February.
This information is explained in detail at PACER.gov