I sold an item and charged £2.70 postage, when i went to post the item at the post office, i was told the amount of postage was higher than that on the QR code on my mobile phone. I have gone on to ebay to print another label of a higher amount, so it can be dispatched. But i am being told that only ONE LABEL can be printed for this item? What should i do? I need to increase the postage cost on the item via a new QR Code, but i am being told this is not possible?