Hyundai USA Battery just over 200 miles out of the warranty period, checked 1 week before - goes dead a week later mid-summer Columbus Ohio

Had my 2016 Hyundai Elantra at Dennis Hyundai Morse Road in Columbus, Ohio for a service appointment 1st week of September 2017.  Everything passed fine and oil change done.  Less than 2 weeks later my car wouldn't start.  Jump started it, drove it a few miles.  Turned it off and it would not start again.  Had it towed to the dealership and the battery needed replaced.  Naturally when I had the service appointment the mileage was under 36,000 miles but it was now 36,292 miles and the battery is not covered under warranty.  $269.76 out of pocket on a car that has a 6yr/60,000 mile wearranty.  Oh, but the battery is exempt from coverage after 36,000 miles!  Strange that less than 2 weeks before it was fine then magically after the mileage just tips over 36,000 miles, and in summer weather, the battery dies with no warning signs of deterioration or symptoms prior to that.  I filed a complaint with Hyundai Corporate (hyundainationalcustomercare@hmausa.com) on 9/16/2017 and never received a response.  A copy of the email was saved as I thought well enough to CC it to myself.

Fast forward to 1/22/2018 and I take my 2016 Elantra to a different dealership to have the shark fin antenna (plastic fin-like antenna) replaced to reattachd because it came off while I was spraying my car at a hand spray car wash.  The reverse camera also stopped working over the same weekend (do I have the worst of luck or what?) but I thought, no biggie.  The warranty will cover it.  WRONG.  Hatfield Hyundai in Hilliard, Ohio said the antenna is not covered because it was not a manufacturer defect and the backup camera is not covered because there is a different stereo that was installed.  1. If a plastic antenna cannot withstand the pressure of a car wash spraying hose then why the F is it even a manufacturer tested and installed part on a brand new car in the first place?  2. The stereo only displays the signal that the camera input connection sends to it.  When the car is shifted into reverse the stereo display senses the car is in reverse but the stereo is not receiving a signal from the backup camera, a camera that is factory installed and not an aftermarket camera.  The stereo does not send any signal whatsoever to the camera.  The stereo connection is only an input connection but naturally anything the dealership can do to say the warranty does not apply looks good for their bonuses and bottom line.  I have had it with the entire Hyundai company.  More than $50,000 later and this is how I am being treated by a company that is so proud of their acclaimed 6/60,00, 10/100,000 mile warranty.  Anything they can do to jack you out of your investment and not honor their warranty, they will.  It's Korea afterall.  What should I have expected?  Lesson learned.  Never again.