They're a mortgage assistant help service. As for it being legit proceed with caution as with any financial and personal matter. Do your research first.
Another, unsolicited call/ hangup from the same scam company I filed a complaint against yesterday to, "assist" with my slow pay mortgage. They are not affiliated with any company I do business with.
To date I have file 4 complaints against them to my state and federal do not call lists. Hopefully it's a trackable number.