Firstly before u offer a price to a seller be considerate because what we have here is used clothes 1-2times that actually still looks new with no defect. Prices given are usually very reasonable. U offered 20 with postage u mean? Which is like 10bucks for postage to Kota Kinabalu, so ur price is only 10 for the dress? Ohh please be rationale..
Saying sorry to decline the offer is good enough.
Thanx for the free feedback anyway😀