Sold a Mulberry bag last week for £200, was bought for £900 years ago and was in extremely good condition. P&P was clearly stated as £7 2nd class, I'm a bit shit at guessing and the bag was heavy. ANYWAY... she's messaged asking for the £3 difference between the £7 and the actual cost of £4. I'm worried if I don't give her it she'll start some kind of war against me and open a case and I'll have to give her all her money back, whereas I want to message asking if she's on crack and to go away.