eBay Refund Question

This seller obviously regrets the price they agreed to accept after some back & forth ($24.50) and wants to resell the card.

I am still relatively new to eBay and got this message. I am assuming they want me to cancel to avoid a bad review?

Should I ask them to just cancel on their side? I want to make sure I’m able to properly give them a negative review for their scummy behavior.

I will never understand how sellers will try to go back on an agreed upon sale. O well.

Thank you for any advice!