It takes 31 days for businesses to take your number off their lists but i registered all our numbers on the National Do Not Call registry at donotcall.gov. Hopefully after a month no more unsolicited calls. I read their tips they say hang up on robocalls or prerecorded calls right away and don't press any mubers, and blocking these calls can be expensive because they use caller id spoofing and continue changing their names and numbers. I hope this helps anyone because I can't stand it anymore. You can't even take a decent nap. I couldn't report them to the better business burau because I don't have enough information on the company.
We are a state government agency and have been receiving 3-4 calls a day (generally in the morning) for most of this week (14-19 October 2013). When the phone is answered, there is only silence. A call back to the number gets the standard "We're sorry, your call cannot be completed as dialed."
Called the number from my ID blocked number and the recording identifies them as "Injury Claim Group" and asks you to press 1 to be removed from their list (obviously, I didn't press 1)!