Go to the Legacy version (menu on the left) and check the voicemail tab. You have call screening or some other voicemail function on. (I just went through this the other day - I don't remember which function I had left enabled, but as soon as I disabled it, calls started coming through [just in time to wake me up this morning to tell me that I had won some contest I had never entered - sometimes you wish the voicemail system had more AI in it].)