Is Northstar Cash the same as Northstar Location

I was just wondering is Northstar Cash the same as Northstart Location Services. I have someone calling me saying I owe these people from like 4 or 5 years ago and that I tried to write a check to these people that had NSF. For one I don't remember the name and two I didn't write a check to anyone that has that name. I haven't received any letters from these people, then all of a sudden someone named Mark Sanders calls me from this place called ACR Associates and told me they are filing papers for me to go to court. I know nothing about this because I hadn't received anything from the place that says I owe them money. Please let me know what you think.