I have a couple, I really hate student loans, they are great when you are in school getting it paid for, but having to repay it sucks and just seems never ending. Good Luck with your student loans. I'm in the process of getting it consolidated.
usd/glelsi stands for Great Lakes Educational Loan Services Inc. They just showed up on my credit report and I did some digging and found out who they were. My problem with them is I just started school three months ago and I am still a full time student . They still have me pass do for a payment of $6,500
Here is the link to the contact us page. https://www.mygreatlakes.org/educate/contactUs/home.html
The website is mygreatlakes.org. if that doesn't work and then you would just go to the contact us link at the bottom of the page. I hope this helps. Good Luck.