The only detail to getting Ebay to help is to follow their instructions and do everything needed promptly.

I ordered a wire harness recently and evidently i ordered the wrong one. The model had 2 types of wiring harnesses. I provided the VIN to get the part i ultimately ordered, so they should have gotten it right. I contacted the seller and they gave me a line about no responsibility for fitment. In turn I contacted Ebay and Ebay provided instructions to return. Once I had the shipping info I sent the tracking number and within about a week I had a full refund.

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Toyota is a leader only because their drivers block everyone behind them. Oh what a feeling.