Promoted ad fees are incorrectly calculated

[123.chemist]

Instead of calculating the promoted ad fee based on the actual sale price, these fees are calculated based on the original price. Which is higher, of course, than the price finally settled via offers and negotiation. 
This situation is valid for the past few months and visible on my invoices. 
Check your invoices good people. 

[ypdc_dennis]

Sounds like a programming error if the ad rate and item's price when the listing was first clicked is getting used. Correct for the ad rate but not for the final sale price. 

tyler@ebay 

Ad rate is the percentage of an item's final sale price (excluding shipping and taxes), and is only charged when a buyer clicks on the promoted listing and purchases the promoted item within 30 days of that click. The fee is based on the ad rate that was in effect when the promoted listing was first clicked.

https://pages.ebay.ca/seller-centre/selling/promoted-listings.html

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[123.chemist]

Yes, it is an obvious algorithm error. I called eBay and the representative said he will return the difference, as per what calculations I demonstrated to him. It has been a week and there is no return processeds.