Once you do business with them they are allowed to call you even though you are on the DNC list. It's a loop hole. I think they can call you for up to a year or possibly longer since it's (possibly) not a sales call but a follow up call.
at 5pm i got a call from this number i picked up and heard a ringing(like i was calling someone) after a ring a woman picked up the line as if i was calling her.....very confusing