Refused to change my jeans

A month ago i bought a jean at markhams Menlyn and after i bought when i put it on the first the loopsstiches damaged and i was at hatfield dat day so i went to Markhams hatfield and i found some lady and showed her because i was wearing the jean and she said to me they cant take it because i already put it on and today 2 more loops also broke in a month i mean if you buy jeans for 699 you expect it to be of great quality and not be damaged in a month,on the same day i bought that jean i bought a pair of pants at MR price for 139 and those pants are still in good condition,i have 4 relay jeans i bought from markham and this is the first one to be of such inferrior quality