What kind of support is available with C3 subscription? C3 comes with unlimited complimentary support. We do not charge any support fees for support. By user|2020-06-18T19:53:53+00:00May 14th, 2020| Share This Story, Choose Your Platform! FacebookTwitterLinkedIn About the Author: user Leave A Comment Cancel replyComment Save my name, email, and website in this browser for the next time I comment.