Bought an item and happy to pay the postage as looking at royal mail assumed this was the best price for item.
Item turns up with postage half of what was quoted. Obviously managed to pass it as smaller parcel.
Contacted seller to ask if partial refund possible as double costs is a lot to pay. Seller says its to cover petrol and selling costs.
I've explained this is against rules. They say it's happened to them and eBay never sorted it so they're doing it too 
I have been polite and not unreasonable but they're becoming quite rude and now say they're not refunding anything if im 'being like that'. All I said was it wasn't fair to punish me for what's previously happened to them.
I understand I agreed to the postage before I paid, I get that, but that was on the understanding that would be how much it cost the seller to post it.
Can I report it to eBay?