Product: Student loan

I am writing to enter a student loan complaint for my wife against the Navient Company. 
Navient has a loan with my wife sinceXX/XX/XXXX. They have not provided monthly statements regarding her accounts. They did not fully disclose where her payments were applied. For instance, they would give her a monthly statement then skip 2 months before the next statement. Her balance kept rising even when she paid the monthly bill. There were many months none of her payment went to principal even though she paid every month, and then they would add an additional XXXX or XXXX hundred dollars to interest without explanation. We contacted them several times and the service rep could not provide explanation neither could their mailed responses. The bill would never get paid this way. 
What we want at this point is discovery like they provide in the courts. That is a full disclosure of monthly statements of the two loans since it's inception, detailing the principal, interest charge, payments made to principal, payments made to interest and ending balance each month just like the amortizations that is provided with a home mortgage loan. 
Attachments : Attached is Exhibit 1 : dated XX/XX/XXXX. 
The Effective Date is the first column displayed. 
It starts at XX/XX/XXXX, then XX/XX/XXXX, then XX/XX/XXXX, then XX/XX/XXXX etc. 

1. We would like to see the missing statements of XX/XX/XXXX, then XX/XX/XXXX, then XX/XX/XXXX etc. 
for every month interest was accruing and recorded. We want to examine how the interest is accruing and would like to see the results of how our payments are applied. 

2. Also on exhibit 1 for the following dates : XX/XX/XXXX We want to know what was the transaction amount for and how did interest of {$640.00} get accumulated if it is the first transaction of the loan. If it is not the first transaction then we need to see the first transaction from the inception of the loan. 

3. XXXX/XXXX/XXXX Explain what is the transaction amount of {$21000.00}. Do you have documentation of this transaction? 
3. XX/XX/XXXX How is the principal amount {$15000.00} on a {$5000.00} transaction? 
4. XX/XX/XXXX What is the basis of transaction amount {$15000.00} and if this is a new loan amount how is {$730.00} automatically added on to it? Where does this interest come from? What are the principal, interest rate and period this interest amount is calculated from? 
5. XX/XX/XXXX What is capitalized interest? That needs to be broken down on a monthly basis. 
6. XX/XX/XXXX is missing along with other months. 
7. XX/XX/XXXX Why none of the {$300.00} payment is applied to interest when a payment was applied just the month before? The same question for payments applied XX/XX/XXXX, XX/XX/XXXX, XX/XX/XXXX, XXXX, XX/XX/XXXX. 
8. Exhibit 2 Capitalized Accrued interest of {$570.00} dated XX/XX/XXXX. What is that for? That needs to be itemized. In Exhibit 1 to see how that figure was obtained. On Exhibit 1 XXXX paid the amount of {$290.00} on the dates of XX/XX/XXXX, XX/XX/XXXX, XX/XX/XXXX, XX/XX/XXXX and that approximate amount for every month there after until the year XXXX. So how does an extra {$570.00} in interest pop up? These inconsistencies appear throughout her loan period. 
9. Exhibit 3 - Capitalized Accrued interest of {$2300.00} needs to show how calculated. 
10. I could go on and on with the inconsistencies of this loan but I won't. However the questions that I set forth needs to be answered. Can you determine and follow how these interest amounts are calculated?