Hello,
I'm sorry you are having paint concerns.
It is very true -- for dealerships, loyalty is a pretty big thing when it comes to trying to get help with a concern after the warranty has expired. Servicing at your local dealership can cost a bit more than other well qualified local shops, but your patronage also enables you to be in "good favor" when seeking "goodwill" assistance.
The other thing that helps is buying the car new, which you did.
If you have already escalated up the corporate ladder at Kia, then there is likely no further recourse; the warranty is what it is, and when it's over, they bear no obligation to do anything to repair the paint on your vehicle.
I bought a 2013 Kia Optima brand new and within the last 6 months im having same issue. Paint literally flying off my car! Its been garage kept, and mostly hand washed. Im scared to even was my car because more pai t keeps coming off. The dealership days theyve never seen an issue like this and keep asking if it had a previous owner that had a paint job. They are not taking responsibility so as much as I love my car...the quality sucks
As my previous answer stated: contact Kia directly and ask for help. Be in direct touch with the service manager or general manager of your local Kia dealership and seek action. All you can do is try, and yes, they can say no, but maybe you will get somewhere. Good luck.