Just been told by my local garage that the rear diff on my car has failed and needs replacing. The car was last serviced one month ago but not by a Hyundai dealership. Being a 2017 model it is just out of warranty, but surely this shouldn't have gone with such limited mileage?

The garage who have looked at it say it looks as though something has failed inside and it has exploded so there is now a hole in the metal casing. Is this likely to be a latent manufacturing defect that Hyundai should pick up (even though it is out of warranty) or have i just been unlucky? Cost to replace has been quoted at over £5k for the part alone so I am at my wits end!