Received a call this morning. My caller id says CustomerService. No one said anything and then I got the dial tone.

Jan 14, 2016 received call from 313-349-4682 10am.  Caller id said Custer service.  Doesn't say anything then I get busy signal.
What happen to the Do Not Call list.  Plus I pay for unlisted phone #.

The DNC list is NOT a magic call-stopping switch and criminals aren't going to follow the laws anyways. As for your number, computers calling every number in a sequence