AES/PHEAA Student Loan Complaint

AES/PHEAA Student loan department,

Non-federal student loan Dealing with my lender or servicer Trouble with how payments are handled Colorado

I recently consolidated my student loans with another bank/loan servicer. The loans after a lot of time in between were finially listed as paid in full. However there is a credit attached to my previous account. That credit has been on my account for well over 30 days and I believe American Education Services is purposely holding onto my credit as a way of punishment for leaving their company and add extra unnecessary interest charges to my new loan. I believe their response time to refunding this credit to me or my new lender is completely unethical and want this credited to me or my new loan ASAP