Northland Group Inc. NGI@northlandgroup.com SCAM. THEY ARE LOOKING FOR CASH ON NON-EXISTENT DEBT. Minneapolis, Minnesota

Just received  letter claiming a debt of 566.32.    I haven't had or opened any type of credit in 15 years.  They are offering to 'settle' for 84.96, broken into three  payments.
It might sound very reasonable if I actually owed anybody anything, but I don't.

I am ignoring it, and I've had a couple other of these through the years.  In the past, whenever I tried in good faith to find out the specifics, thinking that I had overlooked a bill somehow, all they did was double and triple-down their efforts to contact and/or make threats.  I have never had a scam company like this do anything if they were ignored.