Damaged Goods

I bought white palazzo pants around november cash at Jet cradlestone, I worn the pants once and I was happy and satisfied with the purchase. December I decided to wash the pants and it shirinked to the point that I can not wear it anymore, I went to Jet cradlestone and speak to the manager and show him photos of the pants before and after I washed it, He told me that there is nothing that he can do as I dont have a slip, I then phoned Edcon customer service the lady whom I spoke to told me she cannot help me if I dont have a slip and that I when I return their mechandise it must be in its original condition, tried to explain my story to her that the quality of the pants is poor thats why it shirinked after one wash she then dropped the line on my ear. I am not Happy about service I got at Jet. I do not demand a lot but to exchange the pants for something else of the same value but I am being treated like I did not give them my money.