Sallie Mae Unreasonable, Paying while in college, Payments raising. Wilkes-Barre Pennsylvania

Last year I attended a University, (South Carolina State University), and had to take a Parent PLUS Loan in order to attend my first year of college. After I finished my first year, Sallie Mae started sending me payments not even a month after I finished.

Unfortunately, I am not able to attend that school anymore due to financial issues. So I decided to attend a Technical College closer to where I stay now. Sallie Mae stated that she will not start sending bills intill after you finish school or 6 months if not attending. So why am I getting bills a month after I finish only my first year of college?

I've recieved 5 bills already and now I have the 6th right infront of me and its no longer a certain amount, it had gone up. I understand that there is an interest. But what I don't understand is why I'm recieveing bills when I'm not even finishing with school and is currently in school as we speak. 

I feel like Sallie Mae is a very impatient company and it needs to be re-evaluated. I refuse to make payments as a college student. I can't afford it.