Product: Debt collection

I received a phone call yesterday XX/XX/XXXX asking me to promptly return a phone call to phone number XXXX. When I returned the call the woman I spoke to said their office received a complaint about a debt I owe. She never said she was with a collection agency, nor anything about collections just that I was going to be sued for a repossession. I do NOT have ANY repossessions. I own XXXX of my cars and the XXXX is currently financed and in good standings. When I started to ask questions the woman became very rude. She could not tell me the make or model or year of said repossession, nor could she tell me the original debtor. She repeatedly said XXXX, to which I asked her if she meant XXXX. As I do business with XXXX XXXX for a medical condition I suffer from. She then agreed and said the debt was for XXXX. Again, that is incorrect information as I do n't have any XXXX. 
She asked me if I checked my credit recently, to which I replied I check it weekly. ( I have very good credit ) She then told me that they temporarily removed the negative marks until after we go to court. There has NEVER been any negative marks for any repossession. I got off the phone with her and immediately called my wife to double check my standings with my credit report as well as XXXX XXXX. 
There is nothing on my credit report as far as negative goes and the billing department at XXXX said they use a local collection agency and have never heard of this one. 
When my wife called to get general information on the business the phone rang about 10 times before someone answered and the woman who answered was extremely rude. She said she would n't be able to give my wife any information as I was at work and unable to give them authorization to speak to her. She again stated that she was just wanting information on this company not my file directly. She was told the name of the company was Miller & Associates and that they are a mediation company that deals in assets and Liabilities ; again nothing about a collection agency. My wife googled the information she was given and could find nothing on this business. 
I then called back, as I was on my lunch break. I kept being transferred and placed on hold. Finally when the woman was ready to speak to me she told me again that they were a third party company and that they do n't have any information other than a dollar amount. She could n't even verify my address, nor her company 's. She just kept telling me XXXX XXXX. I told her that I was going to report her to authorities and she said that it would n't stop her from doing what she is doing. She said I could present any information I had during the trial. When I asked her what court I would have to appear in she told me she did n't know that I would receive something in the mail. She did n't even appear to know my address. She did spell out the company name for me to find more information. 
I did find a website for them. The contact phone number on that website appears to be an unmanned phone as when you call it immediately sends you to a voicemail that does n't even give you a business name. The message just says the extension you are trying to reach is unavailable to leave a message. 
All over the website it boasts that it is a collection agency that treats customers with respect and compassion, but it is my experience that these people are scamming people and threatening them with being sued. 
The part that concerns me the most is they do have my name as well as my social security number as she made me verify it. At first just the last XXXX characters then the entire number.