Buyer left unfair feedback

[oweneverything]

OMG I believed a buyer overbidded for an item and refunded them £8 . As a result the boys address disappeared of the system before I could send. I emailed the buyer to explain what had happened and how I needed there address. They never responded, instead opened a case against me and left negative feedback.  I've asked them to review the feedback and I'll send the dress at the discounted price. But no, they've said they cant be bothered. 

Now I dont seem able to report this, as when trying to report it, I get the run around with the ebay assistant.  So I've now been penalized for been kind!!!! Idiots

[plpmr]

adding to the advice already given -

If the buyer reports the false positive you left them it will damage your account more than the neg they left.