This colleciton agency collects bill for Hospital and different Dr's offices , the reason they cannot leave message cleary is that there call centre is based in Pakistan. See their website  it states for one of the key personnel :

Muhammad Adil - Overseas Collections Manager

Mr. Adil has been with MSG since 2005, and his first hand knowledge of task management, attention to detail, and advanced technical skills background has been a perfect addition to our management team. Adil helped spearhead our PAKISTAN office, and oversees all aspects of the day to day operations of this facility via our Chicago office. Mr. Adil can help coordinate virtually any type of collections needs from this highly proficient group of 50 plus associates.



Staffing

MSG employs 200+ personnel in management, collections, clerical and technical support. MSG has a call center in KARACH , PAKISTANthat employs 50+ personnel. MSG will assign one of our highly skilled collection teams to Our Client. This team will focus on increasing revenue for the client while maintaining a good standing with the debtor.

Our in-house facilities accommodate a skip-tracing department, automated mailing department and a predictive dialer.

They keep calling me asking me to press 1 if I'm Michael Gray, and press 2 if I'm not.  If I press 2, they just figure he's not home, and keep calling back.  Finally pressed option 1 and got put on hold.  I just hit redial on the number, picked 0 for operator and they *said* they took my number off the list...we'll see!

OMG really if it IS collections, people have not paid by now, GUESS WHAT?
They are NOT going to. I am checking numbers & addresses and will send DO NOT CALL letters, (certified) they can ONLY mail me junk. Funny thing I have NOT gotten anything in the mail & I AM on a DO NOT CALL List!
I usually turn phone on and then off EVERYTIME they call...........

The law office of Malcom S Gerald, calling for someone else who has never been at this number. An automated message that says "If you are not ___ please hang up" which is ridiculous because I have a right to listen to and use anything you put on my machine.  For an lawyer, Gerald, you should know that.  You leave information on my recording, it's mine.

I received 9 calls in one day from this company and 3 more after I told them not to call any more.
They are a collection agency. I don't even know what the debt is for.