3 Days without business email services with little to no assistance from Stem. They have been compromised

Our MAIN emails have been off since the weekend. I have reported each day since Monday for the last 3 days. They're story is that they have been compromised and are moving all affected clients over to a new server. This is a global company. We have been losing business since Monday and the issue is still not resolved. This definitely implicates the security they offer clients as well as their incapability to resolve issues like this. We do not get updates and if you phone them it's the same story "We will let you know once it has been resolved"