Hi, have just sold an item that when packing I realise is thicker than expected and so is now a parcel not a large letter. The buyer has paid me for a lower amount (my fault I know) but now don't know how to proceed.
I put some extra stamps on the package but the PO won't accept the item and I can't cancel the original prepaid label and issue a further higher value one which of course I'd the extra for..
Why is simple delivery not simple at all!
Any thoughts on how to proceed over this please..