One time, I answered the most suspicious phone call from someone pretending to work in a recovery service and that I had to pay a medical bill to them. I asked

One time, I answered the most suspicious phone call from someone pretending to work in a recovery service and that I had to pay a medical bill to them. I asked what medical bill, they told me it was confidential. I wanted to just forget about it, but after questioning my wife about it and thinking about for a long time and going through our bank records, we found that one time when she went to the doctor and didn't have her insurance info or something, so we never knew we had something to pay and instead of contacting us directly, the unpaid bill went straight to a third party recovery service. It was a small fee, so I assume they lost most of it by paying the recovery service. We didn't move or change email/phone number or anything, so the doctor's office must have failed to save our contact info. The recovery service probably found our number just with names and basic info I guess. And yeah, it makes sense that they can't tell us what it the bill about or which doctor's office it is.