I don't think DH support will call you. And we are just customers here like you.
Do you have a hosting plan? If you have a hosting plan and just register a new domain name in DH panel, you will need to add the domain to your hosting plan via DH panel --> Domains --> Add Domains / Sub-Domains
If you don't have a hosting plan, your email service won't be activated.
If you are a new customer and just signed up with DH, you should receive an email from DH upon successful sign up. To log into DH panel, you should use the email address and password provided during sign up.
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