hi all,advice needed on angry buyer

hi i sold some items which the buyer paid for and the postal cost which was in the invoice sent through ebay sent them a picture of receipt from post office which shows it was sent by parcel force at a cost of £60.18 which the buyer had paid when paying for the items,they are now sending very angry messages about the cost of post and im really not sure how to respond to them ??? 

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that is an awfully large postage amount, how many of your items did he buy?