[General] a refund letter

i paid fees of a institute & its joining date is 16 august 2009.but i got admission in a better institute.so i want to refund my fees from the first institute.its refund rules are "you have to be made a written request before 4 august 2009.the institute already gave me a medically fit certificate .so i want anyone please post me a refund letter with not including the name of other institute.please reply soon.