I got the same hang up. I called them back. They are the Islamic Financial Services. Told them I am on the National Do not Call List and was told I would be removed from their calling list. We shall see.
These idiots keep calling me every single day, it's annoying and I called back and told them to not call me again and they asked my phone number so they can delete me form the calling list I hope they keep their word not calling me anymore.