I've successfully defended a similar claim at work for a similar instance. A customer claimed an item was returned to us for a full refund (which he was not eligible for hence the dispute) however he'd only returned a small jiffy bag with what he determined was the faulty part. He used the tracking number used on the jiffy bag for the return of the whole item.
I fought with Paypal and they didn't refund the customer. He'd used Interlink which have records of the item weight...
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