Listing fees (ad fees) are not refunded - if you paid for them. Currently you have 11 active fixed price listings and you received a monthly allotment of 50 free listings each month. So it seems your listing fee was $0.00. Of course, it is conceivable you sold a bunch of items during the month - like more than 39 before you incurred a single listing fee but that is a low probability IMO.
You may want to add the "immediate payment required option to your listing. I helps minimize none payers greatly for me - haven't had a non payer in over 3 years. Read thsi link for more info.
https://www.ebay.com/help/selling/listings/creating-managing-listings/immediate-payment-works?id=415...
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