Poor Service, poor quality

In December 2017 8 purchased a dress of R1600 for my 30th birthday. The dress didn't fit, to date still has the tag on. I returned to the store under 14 day, 2 to be exact and was turned away as they said it was more than 7 days. I then carried on to try and sell the dress on social media for nearly two years now. The dress is a size large and last week someone is small built, wears an extra small to be exact tried it on and it doesn't fit her. The fit is funny and she advised me that I should raise this with Yde as this is a factory fault. I then did and I was told it's more than 6 months and their designers often change. Firstly I went to their store under a month initially and was turned away... Secondly, I never wanted my money back but atleast something I could wear. I don't believe this is fair as it has only reached this time frame due to them turning me away in the first place and me not knowing that their item was a factory fault. They are not willing to assist me.