Basically, haider786 just bought something from me. The package was light. I stuck a second class stamp on it as I thought that'd be enough.
I went to my local post office who weighed it and said I needed to put an extra 15p on. I did, I think I have the receipt to prove that.
Now, haider has received a card saying an item has arrived but £1.15 is due to pay on it.
What can I do?!