I get tons of calls a week from these type of numbers every week. The best thing you can do is to report them every time they call and not answer their calls. It keeps your number in their system if you don't answer and never do they lose interest.
Received a called from 3472465169. I did not answer the call thinking the party would leave a message. I am so happy this site is available. Now that I see what I could have potentially been dealing with the number has been placed on my Blacklist.
Called me three times in two days. Told them to take me off their list all three times. Was promised they removed me from their call list, called me back again within the hour. We'll see if they call me back anymore times.
They called us twice yesterday ... but our number is a Vonage number and we live in Norway so they called at 3 a.m. and at 6 a.m. We were NOT happy. Didn't get to the phone in time either time.