I have received a call from this number at least 20 times in the last three weeks. It appears as ATT service center. I press number one to talk to a representative so that I can tell them to take my name off of their list. They put me on hold for a long time, save a call will be answered in the order received, finally another voice comes on that says to enter your name and phone number ...  And then I'm told sorry this voice mailbox is full and error has occurred