I am fed up. What more do you have to do? I charge only exact stamp cost for P&P, I state that in my listings and that I don't profit on P&P. I estimate the charge as best I can and am usually accurate. Sometimes though the PO lady will squeeze things through as a large letter instead of small parcel or a small instead of medium parcel and so the actual cost is cheaper than what the buyer paid. So I refund them the difference! Sometimes I get it wrong the other way round and I am out of pocket. Some eejit has just left feedback saying 'good condition, fair price' for an item which he won for 99p and the postage was £4.10 exact stamp cost. And I am sure he has given me a 1 on P&P as my stars have gone down
. Sorry, better to get it off my chest 