Kia has no clue how to solve an issue

I have had to send my car for service 12 times in the past 3 months! The warning light comes on, for which I send it to the service centre. It comes back supposedly fixed with a "permanent" solution from Kia, and then within a week, the light comes on again. Kia has now started blaming the quality of fuel for this problem. I find it extremely hard to believe that every Kia Diesel car owner in the country has to send their car to the service centre once a week. I have now been told to ignore the warning light and to just keep driving the car. Kia will not accept that it is a defect and do not respond on the Kia Care help channels.