No negative or neutral
I think the alternative if you are not happy adding the cost of shipping a single jersey to the price of that jersey is to just say you want to cancel the other transaction and buy nothing, not expect that he is going to refund what amounts to almost half of what you bought. I understand your perspective - I think the seller is trying to do/offer what he thinks is right/reasonable. If that doesn't work for you, I think the option more fair to you both is to just cancel both transactions.
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