Bad stitching

Today a month ago(30 Aug), i bought a jean skirt from mr price , once i got home and put it on i noticed the stitching in front is coming loose , i thought nothing of it and stitched it back together so it wont open up more. Today i noticed ALL the stitches are opening up from the bottom. I have had the same problem with a onzy i bought there in January but to spare afforts i let it go and stitched it myself. I am extremely upset about this as i spend money on clothing that i would like to at least wear longer than a year before some types of weakness etc starts to show..