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.
Called me literally 10 times today even after I had asked to be put on the do not call list, then I got lectured by some rude woman. They said they were a different company each time they called and the woman threatened to call my thousands of times. Absolutely ridiculous!!
I recently started getting call from this number too. I only answered once but no one was there, at least not quick enough. I tried calling back & hung up after I heard a recording say that I was being transferred to a representative.
Second call in an hour. No answer when called the number back. Some of these people need to spend a bit of time behind bars.... then they might find a respectable job.