Did you follow this and request the cancellation, or did you just message the
seller asking them to cancel it?
If you have the NPB completed against you, then you can try asking for it to
be removed as you thought the postage was too much. The NPB won't matter
unless you make a habit of placing orders and not paying for them. However, you
might get negative feedback for not paying for this order and would not be able
to leave feedback for the seller.
In the future, ask about shipping costs before placing the order if they are
not calculated by instant checkout or detailed in the seller terms. Shipping
large or heavy boxes internationally with tracking can be expensive.
South Korea, Seoul
United Kingdom, England