no phone service

no service.  im trying to get into my account. i can no longer ask in online chat box. somebody is blocking it when i click on it. we cant receive text messages to verify the account. its blocked too. our landline is down. but im online with my domain name. comcast says i have no internet service. what do they think voip is? its voice over internet protocol!!!! i only have  the talking part with email. but no text,s. it says all is up and running.but its not.