Called back even after I asked to be removed from the list, claiming it was "medical compensation department".

Continuous calls from this number. they change numbers and harass everyday three to four times daily. You cannot block as they change numbers.

Keeps calling, either hangs up when I answer or never leaves a voicemail; when I call the number back, it goes to a voicemail stating that it's a at&t cell phone and the voicemail box is full. Very annoying!

Doesn't leave messages.  Called it back w/ number blocked & got a cellphone voicemail saying its box is full.

Who is using this number?