I see, so the number you can't get through to is Verizon itself. Yeah, the number I have for them is the same.
You may want to try calling them from a different device and find out if there is a problem in the area. If you still can't reach them from another phone, then I would contact your local phone company and tell them of the problem.
I had this once trying to call an 800 number for a major company and kept getting a message saying you couldn't call the number. Had to get the phone company to fix the issue.