I apologize for the inconvenience. They are trying to resolve the credit card acceptance issue. Please call our team and someone can try to personally assist you.
Please contact Member Support Monday – Friday, 8:00 a.m. – 5:00 p.m. ET
+1-866-331-ISC2(4722)
+1-727-785-0189
membersupport@isc2.org
or reach out to your local office: https://www.isc2.org/Contact-Us