Defaulted Student Loan

I have 3 student loans with American Education services, and while 3 are in good standing I have one that is defaulted... after contacting the original creditor, American Education Services, and then the guarantor, and getting calls from a company called Conserve i pieced together that that is where my loan is. I called to try to set up a payment plan, but was told I could not set up a payment plan until I either paid one payment of 892 or 2 payments of about 446. Or I could settle for 7500.

I haven't received anything in writing. The people I have been speaking with at Conserve seem very nice, however have told me that if I don't do one of these three things before the end of the month they will have to contact my co signer and get more aggressive with their approach. I can't remember their exact wording. I am WILLING to pay, and can even put down a fairly hefty sum, because I just got a new job paying me 12 thousand more a year. I will get a check of over 2 grand from my current employer before I leave that i plan on putting towards this loan. However, they are telling me not to the payment plan, no to waiting, and that these are my only 3 options.

Does anyone have any student loan default experience. Can I request to have something in writing? The first time I spoke with them is last week. I can probably work something out to pay the 400 this week, but I want to make sure that I am going to put on a payment plan after this....I'm pretty confused...

I am looking for any help and guidance...and advice! Thanks!