Hi
My DP has bought a job lot of glue from Ebay. Postage listed was £7.
Sellerr has contacted him saying he underestimated postage and it will cost another £12 to send.
The seller said if DP doesn't pay the postage he will cancel transaction and relist item with higher postage.
My understanding was that the postage listed is what you pay and if, as a seller, you get it wrong you have to accept it and price it correctly the next time.
How should we respond?