Same story here. I live in Monterey CA but have a 405 number; I grew up in OK. I have received a call from this number three days in a row, with no messages. I am going to block them.
This number calls my cell at least one to two times daily for the past two weeks. I have tried calling back at various times of the day. The recording is always on saying the office is closed. The individual or machine that calls always hangs up on me and does not speak or connect to anyone that speaks. I am on the DO NOT CALL list. Apparently, that does nothing to stop harassing calls. I will block the number from my phone. Pathetic.