I worked for a massively incompetent electronics conglomerate at one point. They decided to change all of our phone numbers for some reason. My number became a former support number, and if you had an old enough product and looked in the manual for our support number, I might have gotten that call.

Most of the time I just gave the callers the correct number, but if it was a product I had worked on I would try to answer their questions...

Some dumb f* called up once and claimed he had taken the batteries that came with a product of ours he bought, put them in his Apple keyboard, and they had leaked, ruining his keyboard. He was adamant he was owed a keyboard.

I tried explaining politely that batteries leak from being over-discharged... But he wasn't having any of it. I eventually handed him off to customer service, who I assume told him to pound sand.