This concerns a NPB , complaint i believe instead of NSS.
By the looks of it and the understanding of what you wrote;
The seller added picking and postal , and after that you did not pay the invoice.
For future overseas and or any purchases where instant checkout is unavailable;
Use a request quote option
Instead of the Invoice.
You could try to be nice, and request a cancel when the invoice is done and you
dislike the outcome..
But request quote is without the obligation.
Have a good one.
This is a problem; excessive postage is a legitimate reason to cancel an order
and should never result in feedback for either party as a transaction didn't
happen. And for postage costs there shouldn't be an option of an NPB. Holding
a buyer hostage because the shipping cost is beyond what they expected is not
a good way to do business. Most people don't understand how to ask for a
quote, many things are not intuitive here.