Product: Student loan

I am submitting this letter to your agency to complain what I have seen as a form of injustice from FedLoan Servicing. 
I borrowed money from the DoE to pay for medical school two years ago. However, for reasons independent of my will, I had to drop the medical education just after seven months at the school. Today, I am in a repayment period, and I 've been doing my best repaying the money that was not mine, even though I am paying for something I am in no way benefitting from. 
The main purpose of my complaint is that I can no longer accept the chronic, unjustified increase which I think is a form of manipulations of the system in order to have borrowers anchored in a sempiternal state of paying. In substance, something terrible happened to my FedLoan account XX/XX/2016. 
Though an comprehensive investigation should be conducted into the whole account from the time they started charging me on the laon while I did not even start school yet, that timeframe of XX/XX/XXXX needs a particular focus. In fact, during that time, I focused my attention on the balance principal of {$39000.00} for which the unpaid interest was {$300.00} ( Note that I usually do that follow up after midnight since the numbers change after right after midnight ). The very next day, the unpaid interest became {$300.00}. Please do the math with these XXXX numbers of the unpaid interest in that particular day when the principal was {$39000.00}, and you will certainly find {$5.00}. This daily rate should have been jumped to XXXX cents in just a week for that particular principal, since there was no interval of non-payment. They have to provide the scenario of calculation that led them to that increase. I made some payments for which I 've been skeptical about how they distributed them in the system. That 's why I decided to take a closer look at how they have been using the money that I 've been paying at the detriment of my health and well-being. I have no idea how long they 've been doing that until I decided to regularly monitor my account. 
Furthermore, I regularly made payments independently of the monthly direct debit withdrawals. I have exhibits of my payment history for your convenience. 
Based on the aforementioned incongruence, I called FedLoan Servicing and asked to speak with someone in the management. XXXX XXXX, as he said his name was, seemed to have been making tons of calculations while we were speaking over the phone, but only to stick with the newly bizarre {$6.00} daily interest rate that erased the {$5.00} in just one week for a principal that is not big enough to hide that kind of manipulation. Anyone can understand this paradigm : As your principal goes down, your daily interest rate should follow through. But this is not the case with FedLoan Servicing, and with XXXX XXXX, the manager who was on the phone with me. In addition, my payment history has never shown that there was a long interval in which I did not make a payment. How can the daily interest rate go up? I started following it when it was at about {$7.00} a day. Now to come from {$5.00} to jump again without any gap of non-payment and while the principal is going decrescendo, I need answers. 
I would like to bring to your attention that I do not have a regular job. I 've been working as an independent translator for 13 years, long before I borrowed that money. Most of the time, I loan money either from my bank or from other people to try to repay that money. I only make between {$12000.00} and {$15000.00} a year. Every single pay check I receive, I pay FedLoan with it, after I deduct the portion that should go to IRS. I totally depend on people of good will to survive hunger. And that 's why this injustice should be stopped, and the money that I believe they 've been unfairly taking from me should be returned to my account. 
Sincerely, XXXX XXXX XXXX