Send an email to their Help Desk,
HelpDesk@marketforce.com, with the issue. I did this earlier this year and they resolved it.
FYI, here was their final response: "I have been advised by our IT team that the issue with your email has been resolved. They reported that you were on the Global unsubscribe list (one of our emails was unsubscribed) and the Reported Spam list (our email was reported as spam). Please be sure that our email is not listed as spam or the issue will persist."
I never changed a setting and I have them on my safe senders list, but I just stopped receiving all emails from them, including confirmation emails. This has happened at other MSC's with my email, especially Sassie MSC's, apparently because my email gets flagged in their system for some reason...and I have to have it reset from time to time.