Bad Customer service

What a horrible experience received at PEP Bellville Middestad Mall first I went there Monday morning at 9am and waited outside the door till 9:10 and decided to knock because there was no notice advising customer they opening late for some reason, a lady came and told me they have system issue hence they were not yet opened which i asked her why they didn't leave a note then I left .Today I went there again to exchange an item which I bought at pep in main road, entered the store and the was no one at the door therefore I went straight to pick up an what I needed and went to the counter to exchange only to be attended by a rude lady who told me with attitude after advising her that I'm exchanging that I should have left my item to parcel counter next time and I said okay when i came in there was no one in the door so I didn't know. I asked her for cash back and her reply yet again with attitude we do not have money its still early and I'm like you don't know how much I want back and didn't even bother to ask me because I only wanted R50 but because she was already annoyed by me exchanging and knocked on their door the other day she decided to be rude.