Good afternoon. eBay's operators seem to have different understandings about how variants work. Any help is apprecieted.

My understanding: for each variant, you need to have at least 1 product (or more) that belongs to that variant. So if I sell billiard balls, and I have 3 variants (red, green, yellow), I need to have at least 1 ball for each color. Selling a red ball should not affect how the other 2 variants are sold. In other words, if I have 1 ball for each variant in stock, and if I sold the red ball, red variant will become out of stock, green and yellow should both have 1 item of stock left.

So in my case, I have a listing with 2 variants: #1 xbox console ($69.95) , #2 wifi adapter ($47.5). Because I only have 1 console, and if I list variant #2 as console + wifi afapter, it conflicts with my understanding of how variants work, and if 2 persons bought both variants in the same day, 1 of the 2 orders will fail.

To me it's very simple: it's like you buy a car for $20,000 and maybe some accessories for another $2,000 (optional), and if someone bought the accessories only, he / she he can't expect to get the car too.

And of course, a gentleman bought variant #2 and demanded that variant #1 to be also shipped to him. I refused, and explained to him how variants work. He threatened me with negative feedback, then left one a few minutes later. To me he sounded disappointed rather than surprised.

I contacted eBay operators. To my surprise, most of them don't even know what variants are. Some have vague understandings, and call variants as "options" or "select" etc. 1 operator seemed solid, unfortunately he didn't have authority to do anything. So I finally reached two ladies at eBay who have some authority. First one didn't understand what variants are. I closed chat window. Second one said if buyer bought 2 items you should ship 2, I said no he only bought 1, which variant #2. Then she spent like 15 minutes trying to understand this matter, then finally came back saying the buyer has some points, and she also think it's "confusing".

So I gave up. My question: am I correct on how variants work? And if yes, why eBay's operators don't seem to understand? Does eBay have a way for selling variant #2 automatically reduce the stock of varaint #1 ? Thank you.