Who called from 2012213968

I received several calls from this number and to find that when i call back , saying this number is no longer in service ! What the crap is going on with these calls, also the following numbers,
202-638-3946,904-470-2728,989-448-5237,213-985-2394 any one have any answers to this?
Thanks
k

They call, call, call and they don't talk when I answer.

I keep getting calls from this number on my cell and when i answer no one is there and they hang up. i will be figuring out how to block this number.

This number is calling me at least 3-4 times per day.  I don't know who it is but it has reached the level of harassment.  I have reported it to the do not call registry but no change in frequency of calls.  Does anyone else have a way to get them to stop harassing me!!!

I reported to the ftc also I encourage everyone to do so.