In have a question : My student loan was purchsed by American Education Services recently. They sent me a statement showing XXXX due. I mailed a payment of {$100.00} which should have been applied to the principle, but they applied it to interest. When I called about it, they stated that payments go to interest first. That is fine, when there is a balance due, but there was no balance due when I mailed the payment. Please advise. 
XXXX : XXXX University XXXX XXXX, CA.