BB&T Financial Consumer Loan Complaint

BB&T Financial Consumer Loan department,

Installment loan Managing the loan or lease Ohio

I paid my - scheduled payment. I then sent a separate check with the instructions stating, " APPLY TO PRINCIPLE ONLY '' on the check. So, I sent 2 different checks at the same time. They will not apply my 2nd check to only the principle balance and are only applying a portion then applying some to interest and then pushing my next scheduled payment to -. I called to complain and explain that the 2nd check is a principle only payment and asked to speak with management and she refused to transfer me. Instead she gave me a summary of how loans work. I am demanding that my 2nd check sent be applied to only principle. Please help.