Horrible customer service. Store clerk refused to help. Phone more important

I was at jet Eastgate yesterday 30/01. I asked a lady working in the store for help. I was looking for a size for a pair of jeans. I kindly asked if she was busy. She was staring at her phone and told me that she won't help me because the store is technically closed. I was still in the store when the doors closed. I was there 30 minutes before the store closed. I'm a customer that's still inside, why can't I be assisted if I'm still finalising my payment. Do you want my business or not ?I'm returning the jeans I bought and taking my business to foschini. This is not how customers are treated at all ! As long as a customer is inside the store and was In There BEFORE THE STORE CLOSED you assist until they are done.