wrong item sent

I ordered a dress online on monday and paid the R45 to have it delivered with 1 to 3 days. I received the item on friday and it was the wrong dress. I phoned the call centre and told them i wanted the delivery fee refunding the said they would only refund some of the fee as there was another item delivered. I asked which store had the correct dress in stock so i could go exchange it. I was told N1 city had 3 in stock. It took me over an hour to get there and when i got there they didn't have stock of the correct dress. The stock was of the dress i had been sent in error.