receiving calls on cell, registered w/DO NOT REGISTRY

I justr received a call from the same company.  I call ed the number, they did go into if you want to remove your number, I did that.  They state it can take up to seven business days to remover.  Bummer.  There is also another company - insurance.  They leave a messge of "your health insurance application has been approved, please call and we'll get it started."  I finally called & got a person and asked my number to be removed.  It was the fourth attempt to be removed.  So far, so good.