Sorry to hear that you’ve had so many problems. I bought one of my daughters a new i20 Ultimate privately nearly 3 years ago and apart from a couple of minor issues, sorted under warranty, it’s been fault free. It sounds as those yours was a Friday built one!
Can I ask what was done under the warranty?
Heated steering wheels are an acquired taste, but I absolutely love mine and would be gutted if I had to say good Ute to the feature.