http://pages.ebay.com.au/help/feedback/revision-request.html
How Feedback revision requests work
You can send a limited number of Feedback revision requests per calendar year. For every 1,000 Feedback scores you receive in the past twelve months (positive + neutral + negative) you’re eligible to send 5 Feedback revision requests.
You can request a Feedback revision only after you’ve resolved a problem with the transaction or if you think the buyer accidentally left you wrong Feedback.
Communicate with the buyer and clearly explain the reason you want the feedback revised.
You can request only one Feedback revision per transaction.
Feedback you received more than 30 days ago does not qualify for revision.
Feedback left by currently suspended users do not qualify for revision.
You should report any buyer who demands goods or services not offered in your listing in exchange for Feedback.
Submitting a Feedback revision request
To submit a Feedback revision request:
