woolworths poor quality underwear

I bought underwear (boxer shorts) recently at woolworths and it broke after wearing it twice. The stitching between the elastic and the material came loose, so now there are holes in my new underwear. After paying an arm and a leg for it, I expected woolworths quality. Clearly their underwear has shortfalls when it comes to "woolworths quality" then. Very dissappointed in wasting my money on it.