You might be able to turn off eBay sending you feedback reminder notifications in your communication preferences.
https://commspreferences.ebay.co.uk/commsprefs
Press the edit link next to feedback in the general preferences section to see if the feedback reminder turned on or not. If it's ticked, untick it to turn it off.
People should remember karma is like a rubber band.
It only stretches so far before it comes back and smacks you in the face.