I believe the language x9200 is referring to is English, supposedly the standard here, though it presents itself in varying degrees of competency.
Will have to disagree about shop staff not knowing the products, they're supposed to. If they don't know, they're supposed to find out, and not make up random answers. Which happens quite often. And they generally get caught doing it so it's not the best of all possible approaches.
Good to hear you had a positive Harvey Normad experience. My Harvey Norman experience unfortunately was not so good, all I was buying was an iron and they couldn't explain the differences between models very well.
And yes, I can BS with the best of them. By virtue of your questioning that you may not have fully caught the cultural reference or idiom. It's probably an American thing.
It depends whether the person you asking could speak your language well. Not sure whether you're aware of this. One common traits of Singaporean are the "simply Bo chap" (sbc). A typical sbc would choose not to get involved in anything and everything if it is too troublesome. Trying to understand your qns and trying to answer them in a unfamiliar language would be too troublesome.
The job scopes and requirement of the cashiers does not include knowing the products. Next time, ask the promoter or sales assistant around the area where you pickup the product.
So you're a BSer? I was actually quite impress with the Harvey normad sales person when I was accompanying my friend to shop for a new washing machine. He was able to explained the pros and cons of all the brands that are on displayed.