No customer service provided what so ever!!!!

This is the 2nd time posting here and no one hears my cries!!! I called the call centre and store an endless amount of times but no one seems to give a **** about me. Here is my story again.... Okay so here is the problem, I bought a pair of jean about now 4 weeks back at gateway foshini given it a wash as per instructions and used it, after the first wash its so darn stretched out that its falling off me, I checked where it was made on the label and it says Mauritius, cheap China mall clothes are being sold a very high prices!!! So anyway I called the store to advise them of it and a girl answers I told her my problem and she tells me that they cannot help me and puts the phone down what the hell man, I paid so much of money for a pair of jeans and I cannot wear it, the quality is horrible and cheap. I would like a new pair of jeans or a refund that's it, I have been trying to resolve this issue for well over 4 weeks, I'm so sick of this. Also when I returned a ****py t shirt the lady at watercrest mall foshini took my original proof of purchase so now I have no slip for the jeans that I want returned, this is just a big ****** mess. The purchases was made with my store card. Please help!!!