Buyer didn't want the curtains I sold her (have posted this before)due to a misunderstanding about measurements. I agreed to refund including postage. Parcel took its time to arrive but I finally took a postage notification that it was awaiting a fee of £15 as the sender hadn't put a label on it. I paid it, curtains are back with me. Question is, what do I refund? Obviously the price of the curtains but not her postage cost since I also had to fork out £15. Advice please!