My question involves collection proceedings in the State of: Maryland

My question is about creditors targeting the wrong people. There is another couple in the same county as my parents who have the same names and middle initials (not certain about middle names being identical.). Long story short the other couple has creditors after them and due to the similar names they have been calling my parents instead. Any advice on how they can tell the creditors to quit calling since they are not the people who they are calling for?