I am in grad school and my loan has been on deferm...

I am in grad school and my loan has been on deferment for a year. I was notified that I was delinquent on my loan last month and when I spoke with a customer service representative, he told me that I just had to resend my form and enrollment verification that I had already sent in when my loan was initially placed on deferment. (I have never had this issue with other loan companies. My enrollment verification clearly states that I am graduating in 2018). I promptly mailed the paperwork again and was told my account would be on hold for sixty days. A month later, I received more messages that my payments are late. This is completely unacceptable. It should not be that difficult to process paperwork that I should not have had to send multiple times in the first place. This could potentially affect my credit score. Unprofessional and incompetent.