I was told by a seller she will do joint postage then she said after I ordered she wanted 2.50 for each item they were not very heavy in one parcel about 6 to 7 pound she wanted me to pay about 25 to 30 pound for children's summer clothes. how do I cancel order as we have both agreed to cancel order I waited 3 days she not cancelled them I can't find away to cancel it just says ask seller to.