Disapponted with Tshepo Jeans Hyde Park

I'm very disappointed with Tshepo Jeans Hyde Park. I bought a white T-shirt and after i washed it for the first time the t shirt developed strange marks, i then took the T-shirt back to the shop to find out why did it develop those marks as it was never stained by anything. I was then told the t-shirt will be taken to the factory to do investigation. 3 weeks later i did a follow up and it sounded as if the t-shirt was only taken to the factory after my follow up. A day later i was told that t-shirt was stained, and they unfortunately can't do anything. I'm so disappointed with this shop, my advice to everyone out there don't buy white t-shirt from this people they very poor with after sales .support.