You may have given them some of this info when you registered a product for warranty coverage. Often there's a section in the registration section that asks, among other things, income bracket ie; $30,000-$49,000 $49,000-$60,000 $60,000-$79,000 etc.
This info is NOT required for warranty coverage. All they need is your name, address and phone #.
Same thing for when the cashier or the debit card machine asks for your zip code. Just give them the wrong one. It's not a quiz, it's strictly for marketing.