Postage charges

[nanswardrobe]

Hi,

I listed an item as $12 postage ( I usually send in a prepaid satchel @ $12.73) I was posting bulk items that day and had the the item wrapped in bubble wrap, two layers of paper and bound with lots wide tape - the woman at the post office said it didn't need a satchel as it was well wrapped - she said it would be a little cheaper. I didn't check the price of each posted item that day and assumed it might be a $1 or 2 different from my listed $12 Anyway my buyer contacted me and basically said I had robed her as it was a $5 difference  - I said that it had about $3 worth of bubblewrap and paper so in actual fact I wasn't a huge overcharge and I didn't intentionally overcharge her. She was very rude when I said I factor in postal costs and handling charges - she said it should be part of the service. I refunded her $5 and she left me a negative saying I was the rudest ebayer she had ever had - I have made over 1200 sales and never had a negative before. She seems the type that would not remove her comments either. What sort of recall do I have??