Poor/Bad service

I bought a Levis Jean in Edgars CanalWalk on the 31stMay,i wore the jean the friday,to my suprise the quality of the jean was very poor! I went to the store on the 4thJune to Exchange the Jean,i was assisted by Nomsa I gave the slip for the jean, since the jean was worn already it had not Price tag on it,they told me the jean was not from their store after waited for 30minutes, what irritates me is to look like i stole the jean,or swaped the jean-This is extremely poor service as they were waisting my time!Manager Shaun came to assist and then told me the same story,they phoned they camera room to check if i was really in the store!!This has left me very Angry and disturbed to be treated like in this manner,i arrived at the store at 14:20 and was still in store 15:00 for just an exchange(going up and down,checking cameras-Really!!This I will not accept at all