ERROR ON THE ONLINE ORDER THAT I AM REFUSED TO BE REFUNDED NOR RETURN

Good morning I had a very bad experience on my first time ordering from Bathu Sneakers, this pass weekend. i have ordered online the combo promotion R500 for two that was advertised on FB and i made mistake. just after i finish ordering i have realized my mistake it was too late to cancel and contacted their company via email as i was failing to get hold of them over the call. They said they can't help me nor refund me even if i tell my story THAT i reacted as quick, as soon as i realized i have made an error they are telling me about policies now.