The apron and bulkhead are rusting. Since the car is relatively new, what should be done in this case? The service team assured me they would paint and replace the affected parts. Should I escalate this to Hyundai and consider replacing the car?

Without knowing the specific details of your case, it's difficult to give a definitive response. However, it appears that the service centre is cooperating and has offered to carry out the repairs or replace the affected parts at no cost. If that’s the case, we’d suggest going ahead with the work.

Escalating the issue with Hyundai or demanding an all-new car is likely to be a long, tedious, and stressful process, and the outcome may or may not go in your favour.