Bad service

The first time i had bad customer service at pick n pay in atteridgeville at maunde was in December 2018 what happened is that i bought groceries at the shop and some of them were discounted but after the i paid the till slip showed that i didnt get any discount i told the cashier about that but she told me to wait for her to finish with other customers before she could assist me and queue was crazy long . Again today on the 4 February 2019 i went to the same pick n pay and got helped by the same cashier and sge was suppose to give me 2 till slips because I ordered a birthday cake and the other slip i was suppose to take to the bakery and when i told the cashier she just ignored me and continued to help other customers while I was still waiting right infront of her. Im really disappointed and feel disrespected by the service i recieved not once but twice by the same cashier. I dont think i will ever do my shopping at this store again.