I have had a total of 11 messages from Transworld Services ranging from 2/25/2016 until 3/17/2016.  It's always a recorded message directing me to call them back and ask for an Arnold Cates regarding collection of an outstanding debt.  I have no outstanding debt.  This is clearly a scam.  These are the numbers they've called from:

215-391-1384
215-391-1440
215-391-1495