I have been trying to log onto my account and It keeps saying "Your USPS postage account provided by Endicia is being converted to a USPS postage account provided by Stamps.com.Your ShippingEasy account is unavailable during conversion. Please wait for the update to complete."

I got an email yesterday saying my account was converted. I have a lot to ship and need to know how to fix this ASAP. I've emailed CS but it says it can take a day to get a reply! 
Please HELP!!