Disappointed with the construction of guess jeans

I purchased a pair of Guess jeans less than 6 months ago and to my dismay the item that cost over R1500 has torn at the middle and the zip has fallen off, really disappointed with the quality especially seeing that I've had it less than a year. My wardrobe consists of namely Guess items. I purchase Guess due to it being a "superior" brand. I now have to throw away R1500. Guess isn't exactly cheap, I expect to mileage for the price.