[el ess A]

Fine. Then PROVE it to them, not us.

Ever hear the (para)phrase "GM reserves the right to add/modify/delete options/features/equipment/models, etc. at any time without notice."?

FAT CHANCE you'd get GM over a barrel on what they offer as a product or options/equipment on certain cars at any time. Do you get to choose when Cheerios comes out with a "new and improved" cheerio? No. Or if McDonald's decides to drop their Angus (anus) burgers from the menu? No.

Even with new cars, buyer beware. You likely had EVERY chance to go through the entire car before you signed the papers and if you didn't take that opportunity or settle for the idiot dealer's incompetence to get answers to your questions, it's on you (if not, only then you retain the right to b*tch).

It does sound like something's amiss with your suspension controls.

Caveat emptor applies to new cars, too. Sorry. Not feeling my sympathy meter move much.