SCRA – Navient skimping back pay

Hey all. I'm looking for some help with math to check Navient. I think they are trying to pay me less backpay than they should for an SCRA adjustment. If someone could either give me the math to find the answer myself or give me the answer and show the math you used, I would be eternally grateful. The next step will be to get a lawyer and threaten to sue them.

Been in since May 2012 & recently learned about SCRA. I have a Navient loan that predated service. This is the info of my loan pre-SCRA (April 2024):

Original principle was from 2009 – $22,330 @ 11% interest.

Paid $17,500.22 towards the principal (didn't realize that most of my payment was going towards interest).

Paid $18,823.69 towards interest ($16,564.63 of which was after I joijed the military).

Balance left $15,579.85 (April 2024)
Total accrued interest $27,952.42.

Since I only provided my most recent orders, the original adjustment / backpay only went from October 2023 – April 2024. For this relatively small time period, they gave me back pay of $505.

This was exciting because I thought that if such a small time frame took that much off, an extra 11 years should take off a huge chunk. However when I sent Navient my orders dating back to 2012, that's when the BS started. It seems like they started nickel and diming every adjustment making through several calls and document uploads. Ultimately, they removed about $4,000 and that's it. I've asked them to send me the math they used but they won't.

Now the total balance is: $11,164.01
The total accrued interest is: $25,161.99
(This is also after several payments)

AI calculates I should only have a few thousand left to pay, but idk if I gave it all the correct info. I checked, and going from 11% to 6% is 45.45 percent less payment. Additionally, does inflation not factor? $100 in 2012 is $138 today. Any help would be appreciated, thank you.