How do I get my money back, that you admit you owe me, from you?

I cancelled my account in June of 2019. You charged me a non-returned equipment fee of $160.65 on July 30, 2019. I have, and have given you, the return receipt from your preferred returner UPS a dozen times now. This receipt is dated July 7, 2019. You received the equipment, waited 3 weeks, then charged me anyways. I have numerous chat logs, and a few call recordings of you admitting to your mistake, and admitting you owe me the $160.65 back. Why did I just get off yet another phone call that says I will not receive my money back until you can locate the equipment I sent back to you. I've provided you with the tracking number so many times I've lost count. You lost your own equipment and will not refund me the $160.65. The person I spoke with even realizes at this point you've lost your own equipment but she was unable to do anything until it is checked into your system. So how do I resolve this in a way that doesn't involve some form of contact with a 3rd party?