Product: Student loan

I 'm continually given false promises and wrong information from my loan servicer as well as begin denied critical documents/information such as my MPN and payment history. When I asked how my interest was accruing on my loan, I was told by Navient to multiply my principal balance by my interest rate and divide by XXXX. Later, on the same day, I received a letter from Navient that provides an entirely different formula. When I asked for my MPN, Navient tells me they either do not have to provide it or they will provide it on a specific date and then when I look for it on the date stated, it 's still not provided. When I asked for payment history over the life of the loan, Navient mailed me a letter with only the last 50 payments. Their letter says " enclosed is a copy of the documents you requested ''. I 'm overwhelmed because all 50 of my the payments were applied to interest only as illustrated in their letter. There was no clear explanation as to " why ''. When I sent the template/sample lender letter ( provided on the Consumer Financial Protection Bureau 's website ) regarding instructing my student loan processor on how to appropriate my extra funds submitted, regarding paying down my debt, I am told by Navient they do not need to follow it. When I explain that I want to submit extra payments to pay down my principal, after paying meeting my interest obligations, they sent me a letter stating they would apply my extra funds towards future payments -- not principal. They provided an example that if I sent an amount equal to 4months of payments, they would not put it towards the principal as requested but that they would actually allow me to miss the next 4 months of payments. This is NOT what I want ( ed ) and is only an example of deception. Now that I know my loan acrues daily interest of $ XXXX/day, If I skipped 4 months of payments, I would unfairly acrue {$2000.00} of interest on the loan. This is unfair and only benefits them. This does NOT benefit me. On XXXX XXXX, I called Navient again and asked for a way to send extra payments to principal, after my usual monthly payment that is suposed to satisfy both interest and prinicipal, and ensure that the payment is applied to principal. The Navient agent, on a recorded line, said she would overide the monthly debit draw from autopay to meet the exact amount I desired to pay. I wanted to pay $ XXXX/month vs the $ XXXX/month. I explained that I wanted the additional funds to be applied ONLY towards principal. She told she could meet this request. I asked when she would have this go into effect, she said within 24 hrs. Today I logged into Navient 's site and I see that the change promised was not set up. I was again given false information. I sent emails to Naivent on their site and NEVER receive a response to them. They dont even appear in " correspondences you 've sent us '' so I now take screenshots as evidence. Why is Navient doing this? 
In summary, Navient has denied me records, not proven or explained or showed how or that I owed {$31000.00} of interest on the loan that they claim has allowed them to take all of my payments and apply them towards interest only. I 'm given wrong information every time I call. 
Navient told me to ask the US Dept of Ed ( ED ) for the records I 'm seeking. ED tells me to get them from Navient or my University 's Financial Aid office. When I spoke to my University, they told me I was given wrong information. They called Navient on my behalf to assist me in the matter. Navient would not assist them or provide a Supervisor when they requested, to discuss the matter. 
I 'm drowning in debt from my student loan and extremely frightened of my future. No one is helping me. Navient is uncooperative and constantly deceiving me.