I have been getting calls from this number for about 2 weeks now. I do not answer calls from numbers that I do not know, so have been ignoring these. They never leave a message and continue to call on an almost daily basis.

These guys used to call from another number which I finally added to my list as "do not answer". I've had this cell phone number for 15 years. Clearly someone has made up a number and it's mine. They call nearly daily and they don't like to be told that they are invading your privacy. One would like to think that hanging up, as they instruct at the beginning of their message would be enough to get them to update their list, but clearly this isn't how they operate.

Got a call from this number & whoever called didn't leave a message.

Account Discovery Services (sic) / Account Discovery Systems / International Assset Group / Chebat Financial Group / Chebat Asset Management / Chebat Management Group / Chebat Portfolio Management / WNYC LLC
John H. Chebat is CEO of Account Discovery Systems and WNYC LLC. He is likely a principal in the other firms he has named after himself.
An "office" for John H. Chebat and Account Discovery Systems is in Amherst NY (Buffalo NY metro area) with address 495 Commerce Dr. "Suite" 2, Amherst NY 14228. This is a FedEX/Kinkos or similar storefront. An additional mail drop is at Phillips Lyttle LLP, 3400 HSBC Center, Buffalo NY 14203.
Account Discovery Systems also has an office listed at 80 Garden Center, "Suite" 3, Broomfield, CO 80020. They have a registration number of 991698 with the Colorado Secretary of State.

Many calls over 2 weeks between 7am and 9am. Caller left 2+ minute dead air messages, or was silent when I picked up. Today when I picked up, a robot played a recording of a male voice claiming a name of "Account Discovery Services" (sic) with computer voice saying the call was for an unintelligible name which is not my name, and giving me the option to call an unintelligible 8xx number or press 0. 0 resulted in 8 trips through a ringring/attendantsbusy cycle, followed by a woman answering "ADS". I asked for the full name and address of her firm. Eventually I learned base is New York, and the firm is called "Account Discovery Systems", but she would not give an address. Her repeated claim that they didn't know what number they were harassing was untruthful, because this was a call they originated, and further, she started referring to me as a name that is not mine. Nasty scammers.

I had the same problem. I had to call the number back repeatedly and was put on hold numerous time and the call dropped numerous times. FInally, someone answered and they said they would remove me from their list as the person they are trying to contact is not me.

This company calls then hangs up.  Finally, they called and asked for the previous owner of the number, but I have had my number for over a year.  I received four calls in one day.  There is no person to talk to and when you call the number back you are told to leave a message.  It is clearly a collection company, and I'm tired of being harassed for someone else's debt!