Rude and unprofessional staff member

I am so appauled by the treatment I received at one of the Pep store branch at the Jubilee mall yesterday.

I arrived there with my sister and her friend at the store around 17:51, only to find their doors closed. The unfriendly staff member only came to attend to us after a third or fourth knock. Then she was so rude in telling me that the shop was closed and when I asked her why they were closed at that time when there's a sign saying that the shop closes at 6, she remained rude in her response. I told her that I just wanted to pay my account, she dismissed me by saying that they were offline.

I started taking pictures when a man approached the store only to have the door closed in his face. When I was taking the second picture, the rude staff member let the man in.

As a regular customer of Pep, I am dismayed for the lack of customer service that was given to us. I just wonder if the level of service have just dwindled to nothing and that your customers mean absolutely nothing to you (as a store/company as aa whole)