Postage changes

I recently fulfilled an order for a buyer and went to 'create shipping label' but the Australia Post costs were higher than what I could get at the post office, so I did that paying for the postage there. I didn't print offany label, but now eBay is charging me for postage, even though I have updated the tracking. Talking to the help 'assistant went around in circles and was useless. Can anyone offer any advice on how I can avoid paying for postage twice.

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Thank you for the info, but I would have thought that I wouldn't be charged until I selected 'Purchase postage label' not just by looking at the postage options and prices after clicking 'create label'