Men's under is in poor quality

We bought Men's underwear's at Woolworths in Waterfront and we did check the sizes and we took Large. Now I'm unpacking my Man's underwear and it's huge, not fitted was unpacking it but the dark Grey one that I took out first is huge and the bottom part of the underwear is loose, you can tell that the minute my Man wears it, it will be baggy. 3 piece XGrey Bar code ***,bought it yesterday and I would like to return it, only took out 1 underwear as I was unpacking. I know there are exceptions made as I used to work at Woolworths myself and in this case I need your assistance because it was not fitted just the quality is poor compared to the underwear's my Man has from Woolworths. The issue is not the size but the quality is not good at all. You can call please call me at *** or ***