This number has been calling me for several weeks - every day, sometimes two to three times per day. I finally answered today. I do not have outstanding debts. This person asked for me (had my name), then said "This is so and so from Audit Systems, this call is being recorded for quality assurance." I said nothing. He then asked if I would verify my address and the last four digits of my social security number. I asked him immediately what this was in regards to. He proceeded to tell me that he couldn't tell me that until I verified my address and social security number. I proceeded to tell him that I wouldn't verify any damn thing unless he told me who he was and what he was calling about. He said "THank you, have a nice day." And hung up. SCAM!!! Do not give these people your information, even if you think you may owe someone out there something. They MUST divulge what they're calling you about before you have to divulge your personal information.