I have had at least 50 calls from this number which comes up on my caller ID
as Sunbelt Community.  This is a Florida prefix in Broward County.  They never answer and when you try to call back an automated voice says you have
reached a number no longer in service or has been disconnected.  These calls
started about a year ago.  The last one was approximately 6 or 8 weeks ago.

I can't figure out why they're calling if it's only to hang up.  What would the purpose be outside of the aggrevation?