Dealing with a non-paying buyer (with unpaid item case already opened previously) leaving negative feedback

[big_sandwich]

I was selling something and the buyer didn't pay, so I opened an unpaid item case. Someone from eBay messaged me to say that I can request payment from the buyer again, but I never got it.

About a month later, the buyer leaves me a negative feedback with only the comment "no". I reported it, but it seems like I am unable to leave the buyer any feedback either and there is no progress.

Is there anything I can do? I do not want to have my feedback garnished by someone who wasted a month of my time without sending me payment (and I had to pay the Final Value fees as well).

[big_sandwich]

eBay automatically closed the dispute and told me to request payment from the buyer again, which I never received.