If they are a collection agency, why they never leave a vm?

So far I have received 3 calls from this number.  Since I do not know who is calling, I let it go to voice mail.  Nothing but background noise for a message

I have gotten two calls from this number and it's at morning time I listen to the voicemail but it's only background noises and i have had this phone for about 2 months now cause i got it as a new phone for my birthday and now I want the unknown calling to stop!

I get these calls too! i have no clue why im just 12 years old and got this phone for christmas but they call all the time

Got a call from a human at this number asking for previous (clearly deadbeat) holder of this cell phone- I've had the phone for 18 months and the calls still haven't stopped.  I told the guy that Deadbeat no longer had this number and I had no idea how to get hold of him.  He apologized and said they'd correct their records.