I've been getting calls from this number for a few weeks now. I am a property manager so I get calls from all over the country from odd numbers so I didn't think anything of it. They never left messages until a week ago and finally when I got a message I decided to look it up on here. Next time they called, I answered and they said they were collecting on a debt from Citi Bank of South Dakota. After years of paying off all my credit card debt, I know I have no outstanding debts besides student loans. This "Mr. Burns" (all i can think of is the guy from the Simpsons) claims that I have "soo much student loan debt" that I don't even know where it comes from (which is false because I have 1 student loan company I have all my loans through). I told him it was harassment and I'm going to report him for running a scam and he hung up. I haven't heard from him since. Hope this helps.