Merchants Credit Guide Suspicious and Threatening Chicago , Illinois

Today I received a toll-free call from a Miss Scott who said it was not a solicitation call but it was urgent that I call her back at an extension number.  I called the number she left and discovered it was to Merchants Credit Guide.  Mysteriously the word "guide" is spoken so softly the Merchants Credit is what is heard.  I used the extension number as directed and the call hung up on me before the Miss Scott answered.  I thought something was strange about the call so I redialed and this time I heard the "guide".  I immediately hung up thinking it was a scam of some kind, since I recently refinanced my home and have paid off my credit cards with the exception of one which I will get next month.  After doing the internet search and finding the Ripoff site, I began reading the comments from people for years.  How can a company keep this up?  Alabama has a fraud law and a fraud hot line.  I am considering contacting the Attorney General's office to report them.  I reported a company for fraudulent practices with dishnetwork and they ceased to advertise here.  I don't plan to return any of their calls.  Will the do not call list capture these shysters?