Not Happy Costomer

I bought pants on the 27th of June I wore them twice and they were torn apart I came back from with my bums out I returned them now they saying they can't replace them coz it was their first time having a complain like that which is they are lying it also happened with my colleague and it was different pants my sin was not to lie coz I told the guy that was helping me that second time I wanted to wear them I saw a hole and sew them coz I wanted to wear them and I came back with my bums now they won't pay back because of that the price was +- R250 and i was helped by Harold Hendricks Cotton On Bay West Port Elizabeth I'm so disappointed wont ever go back to buy clothing at any Cotton On in SA