Interest on Student Loan by a Debt Collector

My boyfriend is making payments to his debt collector, and the debt collector claims that the interest is 25%. He doesn't even get a statement from the debt collector t show the amount of interest that he is paying. They just send a payment notice, saying he paid such and such amount and then the balance to his account. Can a debt collector put that much interest on the loan and is it legal to not send a statement showing how much the loan is and how much the interest rate is?

Source: http://www.debtconsolidationcare.com/settlement/thread178351.html

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