I don't have service,since yesterday 10:30 pm,what happen with that?

First. Check their site for official info on any possible local outages here;

https://www.xfinity.com/support/status 

Use a cell phone internet service, a public WiFi hotspot, or a neighbor's internet if you need to in order to check it.

Or you can use their Xfinity App: https://www.xfinity.com/apps 

@user_6ll326 Thank you for making us aware that you're having internet issues via Forums. Have you by any chance checked the Xfinity app to see if there's a service interruption reported in the area? Are the lights on your modem turned On?