feeling bad about ill treatment by store manager

i wanted to buy skirts but i first wanted to fit as i am not sure with sizes i went to the manager and asked her to take out the clips as i couldn't fit the skirts and she refused and i was like how can i fit two? then i left the store angry. last week my sister bought boots for me on her identity account and they were a bigger size so the following day i took them back then 1 of the staff members gave me a form for my sister to fill in she did that then i went back again but the manager refused to exchange them for me m so angry and hate identity stores so much. THE store is in Carletonville.