non delivery of item

good day, hello peter seems to be my last resort, I purchased items in the sale 3 for 2, my orders were delivered however I had sent a complaint via email regarding the packaging of one of my orders and in that email I queried an outstanding delivery ( purchase id o ********** 28) , had I not emailed I would have not had a response that 1 of the dresses is out of stock, which I gladly rep**** pls send me a replacement dress and I can change it at a store near me, the emails go back and forth only to be told I cant get a replacement dress and the consultant advised me to place another order, how and why must I place another order and why cant another dress be sent its not like there isn't any dresses available, I should be given an alternate option, im so disappointed in woolworths online. I hope this gets sorted out asap. very displeasing service