24-08-2016 10:49 AM
That's a common trick employed by Chinese sellers, I can categorically assure you that changing feedback (even if it were possible) would not result in a refund.
You are covered up to 180 days from purchase, log in to your PayPal account, go to 'resolve a problem in the resolution center' on the left side of the page, open a case there and escalate immediately.
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