My laptop is stolen

For stolen devices, you are advised to contact your local police authority and file a police report prior to calling Dell.  Then, review this article for how you can declare a device as lost or stolen to Dell.  This prevents any use of valid warranty or support until the Lost or Stolen Flag is removed and ownership is confirmed.

https://www.dell.com/support/kbdoc/en-us/000129627/how-to-report-a-dell-system-lost-or-stolen