Phone: Partners and customers with severity (priority) 1 or 2 cases, or customers covered by warranty can call either of the following TAC numbers (US only).
For more information, see this link
Email: Contact Cisco DNA Spaces support via email, using firstname.lastname@example.org. Provide the email address connected to your account along with your account ID, and if reporting a problem, a description of the problem.
Raise a Ticket: If you have an active Cisco DNA Spaces subscription, you can raise a ticket at this link