Discover Student Loans, the current servicer of my private student loan recently sent me a letter indicating that during a " recent review, '' they discovered that unpaid interest from a previous deferment period was not added to my principal loan balance. Because of this, my minimum monthly payment was lower than what it should have been. To resolve this, they added the unpaid interest to my principal balance ; however, the exact amount added is not disclosed in the letter. Along with this, they have indicated that my monthly payment will also increase, in which that amount is also not disclosed. They have indicated that the adjustments will be reflected on my monthly statement within the next 60 days, but no explanation on the amount added back in and how they arrived at the dollar figure. The letter also indicated that a credit of {$210.00} has been applied to the interest balance of the loan, which is not known how they arrived at that exact figure either. The letter sent is extremely vague and does not discuss how they arrived at the decision or calculation used to add back in the amount to the principal balance or what the new monthly payment would be. The letter also states that this was done to ensure the loan is paid in full at the end of its repayment period. Additionally, the letter states that any adjustments made will not increase the total cost of the loan ; however, my balance increased along with my monthly payment. Upon logging in to my account, it was discovered that Discover Student Loans added back in over {$2500.00} to my principal balance. To find an answer to my questions, I contacted Discover Student Loans where I was unable to obtain any answers, but they did mention that my payment has increased by approximately {$20.00} per month. Out of the XXXX representatives I have spoken to in the last two days, I have not been given an answer as to how they arrived at the calculation used to determine the exact amount added back to my principal balance and they have failed to follow up with me regarding my concerns. I have now been in repayment for close to five years, with 100 % on-time payments. I feel that I am being mislead and I am having to pay for a mistake that I did not make. As you will see in the recent statement attached, I have paid {$20000.00} through XXXX XX/XX/2015 and of that amount, {$20000.00} has gone to interest alone. It also indicates {$0.00} in late fees to date. 

School : XXXX XXXX ; XXXX, OH