<prompt> Human: My student loan servicing company is only deducting the principal from my lowest interest loan. I have documented the dates I sent mail, and each email I sent to them over the last month asking them to deduct the principal from the highest interest loan instead of only the lowest interest loan. I have confirmation that each letteremail has been received. However, I just received my latest statement today and realized that they didnt change anything.Wondering what to do next.Edit: Servicing company is myfedloan.orgEdit2: I didnt target my loans when I overpaid and wasnt aware that there are multiple lenders involved in the standard repayment. I feel dumb. Thanks though.  <response>: You can send them multiple letters a day, every day until your loans are paid off, but they dont mean a thing unless you get one back from them clearly stating that they agree to pay off the loans in the manner that you wish.That is the point of doing everything in writing: to have something in black and white text from the people youre paying stating that they will do things a certain way, and having that document from them means you can hold them to it. If this servicer wont work with you on paying the loans how youd like, look around and see if you can transfer your loans to another servicer that will. I know Nelnet has an option on their website to Pay by Group, where you designate how much of your monthly payment goes towards each individual loan. So you can make just the minimum payments on some and dump some extra into the higher interest loans. 