DeFacto Sent Me the Wrong Sizes After Convincing Me to Use Their Delivery Service

I just bought six things from the DeFacto store in Taksim. I was persuaded to have the things shipped to me instead at checkout, with the promise of a discount. I gave my approval, but the sizes that came were totally off and didn't correspond to what I had chosen. Everything about this system is now a pain. Now I have to exchange the things, and there's no assurance that the local store will carry the right sizes. They have no business providing this service if they are unable to ship customers the correct items. I'm sorry I went with this choice; it has been an unneeded hassle.