Funny story. When I left the company a few months ago, my costume record still showed I had a swimsuit checked out. One with no barcode either, so I knew I had turned it in just someone it missed a scan or something.
I had to go to the actual Costuming location where I had checked out the item and I had to speak with one of the Costuming managers. A costuming manager or supervisor is the only one who can take that item off your record and they only have access to their own region (I know. I tried Contemporary first and they told me they'd love to help but it HAD to be at Caribbean).
I'm not sure if they'll be able to help since I'm guessing you've already left the company? But I agree with goldmay, you'll need to get in touch with the specific costuming location and see if they can transfer you to a leader to plead you case.