Harsh and Rude behavour from the store manager, overall a bad purchasing experience

This review is about my recent experience at Istore at Canal Walk shopping center, Cape Town. I have been visiting the store for the last few years, made a lot of purchases but never experienced such harsh behavior that too from the store manager himself, it happened on 26-Nov-2023. I visited the store in the morning and purchased a screen protector and a back cover for 700 Rands. I asked them to put the screen protector on my new 15 pro iPhone which I purchased from the same store on the previous day i.e., 25-Nov-2023. One of the store people, a lady tried to put the screen protector, but a bubble appeared under the protector, which she couldn't remove, She kept pressing hard on it for a long time and said that's how it will always be. I asked to put another one, and she said ok and asked another lady to put a new one. Again, the other lady wasn't able to put it properly, there was a lot of dust underneath the protector and also on the sides. She also said that's how it will always be even if she puts in another protector. By then, I had already spent more than 1 hour just to get a screen protector installed on my phone which could only take a couple of minutes. I have escalated the issue and spoke to the store manager. He was so harsh that he was even happy to refund the money but didn't want to solve the issue as he found no issues with the way she put the screen protector on the phone. When he said he would refund the money, I asked him what about the 'time' that I had wasted in the store, he said he couldn't do anything about that as they can't be responsible for the time I lost. He also said they installed the screen protector as a 'courtesy' so if that doesn't come through well then they can't be responsible for that. Then he simply moved away from that spot. A lady came to me and returned the money in the form of hard cash. They haven't even issued a canceled/returned invoice. I was shocked to see a store manager responding to a customer in such a rude way and not following the ethics. Didn't expect this in an instore.