Karma or BAU?

You have ordered from these e-commerce companies. And we have all got refunded a bit more than the actual problem costed (genuine ones are correct)

My mother is strictly against it, saying we should compromise at times. This is just adding bad karma to our (life) account.

But I think, these companies are sitting on millions and billions of money If they cash out a refund of 150, it will not empty out their pockets. Instead, we can order something next time for a little less expense.

Your thoughts?