Guess Jeans not good quality

My husband bought me two Guess jeans from Edgars stores in Menlyn with his Edgars account card. I opted guess jeans because most of other branded jeans do not last me a year. I then asked my husband to buy me those jeans seeing their price and I assumed they are good quality. Those jeans are not what I thought they are and I don't wear them anymore after 6 months of sale because they are torn on the thighs. I am so unhappy because I have spent a lot of money on those jeans.