need some help on student loan...(they f**ed my credit)

I had a studnt loan with wells fargo.
which I an automatic payment system set up through AES. after dec 2010, the loan transfered to wells fargo. which means wells fargo will take payments from now.

but wells fargo sent all the notefications to my old address(I told them my new address before), and talking about they called me, which I never receive until my 2 monthes loan delinquency is placed in feb 2011. I also had a in school note to let them know I am still in school to keep me away from the payments, and they claim that they never spoke to me or aware of I am in school. so they starts to ask for paments around jan 2010 without I am knowing.... so the loan delinquency placed now my credit is bad.... heard delinquency stays on credit report for 5-6 years...
please advise me....if there is anyway I can fight my credit back? or any suggests?


sry. for my english... its my second language...