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Help: Being charged interest on a loan for which I received no statements telling me of this debt for the past 15 years. Surprise!
This sounds like a shady trick. I would consult with a consumer debt lawyer in your area. Most county bar associations in the US have a referral service, where they recommend a local lawyer and there is a reduced fee for the initial visit. I think the statute of limitations is 10 years in most cases, but it depends on where you live. From these bare details,I think they don;t have much of a case. Go see a lawyer and don't let them harrass you.