Hi there guys need some advice I recently sold a as new centre - cap via eBay ,sent it 1st class sent the tracking information details to the guy . He now says after a few days he hadn’t received it and wants his money back. Although I sent him tracking information details and it was delivered to his address. How can I proof he’s not got it. ??? As he wants his money back now . I have contacted the actual post office I sent it from and they said they definitely got it and I have seen it from there website via the tracking number too. Any help would be great