Deferring my Direct Loans. . . . . . . . . . . . . . .

So I called up about my direct loan to make sure they received the deferment and even though I sent in the paper work certified they didn't receive it which means that either the postal service messed up or someone else tampered with my paper work. Since the Direct Loan Servicing Center claims they did not receive something that was sent certified return receipt I inquired about faxing it. They said that if I fax it, then it will take them 24 to 48 hours to receive it. I told the girl on the phone that doesn't make sense and she said they only have one fax? and that is why it takes 24-48 hours to recieve. One fax number? One fax machine? I tried to tell her most faxes get their instantly, but it seemed senseless to go any further and just a waist of my precious time.