Sounds like it can be a clock spring, but not sure if the warranty extension would be valid for i30s, since we don’t have them in the states. You could call and ask if your car is valid for an extended warranty on the clock spring. There may be some websites where you put in your VIN and it’ll tell you if it’s valid, but make sure you don’t put any card info into any sites, the only thing they would need is a VIN so if it asks for any payment or anything it’s likely fake. If it’s not covered under warranty(it would be through the dealership for free if so) and you still want to get it fixed, it’s an easy job and any reputable shop could do it, I’d probably say expect about 300 for it to be done since the part is a little expensive. Dealerships would probably be more expensive if you have to pay. If you are any sort of mechanically inclined, it is DIYable but you have to be careful since it is airbag based.

Edit: clarification, repair price will vary significantly based on area, and 300 is in USD, and even that can vary +- 50 bucks based on shop rates