Keeping calling for no reason

They keep calling; for a week now. When I answer I get "thank you for holding, your call is important to us" and no one picks ip. Same thing if I call the number back

They called me everyday, two to four times a day, I now have them on my dna list (do not answer) I got the same thing too, please hold,your call is very important to us the next representative we be right with you, first of all, I didn't call and  how are you going to call me and put me on hold?

Its convergent, a debt collector, They are a junk debt buyer.  I just called them back and had my number removed.  I don't have any collections....I watch very closely

they keep calling but don't leave a message. If i call it just puts me on hold forever!