Refund linked to feedback change

I ordered an item for my wife which isn't as described and is unfit for purpose. I contacted the (Chinese) company who offered a 20% refund which I was not prepared to accept. I left them (truthful & accurate) negative feedback. They are now accepting responsibility for the faulty item and are offering a full refund so long as I change my feedback to Positive. I cannot in all honesty do that but have offered a Neutral revue if they refund my money. They insist on me changing it to Positive before they refund me. They accept responsibility and are willing to refund in full but linking a refund to me leaving inaccurate and untruthful feedback is surely unethical and maybe illegal?

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Anonymous
Not applicable

Report it to Ebay . as its Feedback extortion ..  I always check revised FB on all sellers now ( I personally treat them as negs ).