called 4 times in a row, noone talked to me or answered when i dialed the number back. very aggrevating

Almost every morning this number calls at 8:07am and wakes me and my infant daughter up. I call back and all I get is a busy signal. Would love for them to stop but have no idea how to get on their DO NOT CALL list since there is never anyone there!

i get 6-11 calls from "doctors group" a day, between 6 a.m. and 9:45 p.m.  all hangups... whether i answer or my machine does.  i have called the 1-800 number i found for the company "metro marketing" which does these calls and asked to be removed 4 times now.  so, tonight, i called again, and left a message at every extension available... hopefully SOMEONE in that company will get the point that i don't want to be troubled with their calls again!  i contacted my attorney and he said after asking to be removed three times, it is grounds for harassment suit... and with the several hundred complaints i have found on line, i think we could all unite for a class action suit.