Disgusting Service at Pep Store!!

Just this afternoon I was at a Pep store in Junction Mall at Newtown, where I wanted to make an exchange and pay in the difference. The cashier by the name of Thandeka rudly says to me that I will not receive my original receipt back. I calmly tell her that I would like my receipt back incase some of the items don't fit my son and need to be exchanged or refunded. Before I know it, she is shouting at me, and giving me attitude in front of other customers and said that if I want a copy of my receipt I should go and get it done myself. What was more frustrating was that the managers there were just watching this behavior and did not intervene. After walking out of the store I realized that Thandeka didn't give me the receipt for my new purchase, I had to go back inside and spend another 10 minutes waiting for her to reprint it as she had misplaced it. Again, I didn't receive any apology from her or any of the managers who witnessed the whole situation. Very disappointing!