Callers get a message the voicemail box is full when it's empty
When callers call my number they get a greeting that the voicemail box is full and they are unable to leave a message. I've tried resetting my phone, deleting any messages, calling 1 from my phone and verifying there aren't any voicemails. Verizon had the same issue but was able to fix it now ATT is having the issue but nothing seems to fix it. Any help would be greatly appreciated.