A buyer in Hungary bought two of my items that ended on Saturday. He paid for one of them on Sunday and changed the P&P to £3.80 from £1.50. I do state in my listings to contact me about overseas postage and that I only send by International Signed For. I don't understand how he changed the postage costs himself.
He then marked the second item as payment sent on Monday after I sent him an invoice including the extra postage for the two items. I'm pretty sure I know how this is going to go and I'm going to have to open cases against him. But how will i open an unpaid item case when he has actually paid, just not enough?