Sold a few things on Ebay the other day - got a message from one of the buyers today asking whether I paid postage on the item and enclosing a picture of a charge card they received. Now, obviously I did pay the postage (took it to the PO and had it weighed, as I never trust myself to do these things!). I assume the postage must have fallen off in transit, or something - the PO person attached it after taking the parcel from me, as usual.
So, clearly I'll need to refund postage here, but I'm not sure whether I should do so immediately, or ask for a copy of the receipt from the buyer confirming that they paid it (the charge card just says "amount due", so I'm not sure whether they actually paid and collected the item or not). I'm leaning towards just refunding the postage and chalking it up to experience - but should I ask the buyer for some proof, given that I don't know (1) whether they've collected it, or (b) whether it's even my parcel that was underpaid?
Any ideas welcome - just want to do the right thing!