925-293-3386 Wait for the prompts, shopper portal. They always answer the phone during business hours. They get back to the emails usually in 12-24 hours, and they will document that you notified them.
MF has been doing some work on their site which is why all the issues logging in. I wasn't able to log on for a day, but can now. They posted a message that the issues have caused a back-log in e-mails and to be patient. I've been waiting for an e-mail reply for two days, but since the issue is on their end, I'm not worried.
From their website:
"Note: We are primarily email-based with a limited phone staff. Our number should be used for emergency questions while shopping.