Livid with Hyundai Fourways service!!

I booked in my Hyundai Kona on the 13 June 2023 as my vehicle has a MIL light that came on the 11th June, was assisted by Kim,got feedback that the technician didn’t find any faults in the vehicle when he ran a diagnostic on it,said they reset the vehicle and light was off, technician asked if he could take the car home to test drive to see if the light wouldn’t come back on and would give me feedback on the 14th. Next day Kim calls me to fetch the vehicle as the light hasn’t come on, I drove the vehicle and light was back on the 15th, called Kim and she said the sensors would probably need to be changed and she asked me to bring it in on Monday(19th June), I drove home to Rustenburg on the 16th and my car was fine till the 17th when the car wouldn’t move, it would switch off when I accelerate,called Kim and she referred me to Roadside Assistance as my vehicle is still under warranty and service plan. Car was then towed to Hyundai Rustenburg were the dealer found dirt in the fuel tank which was cleaned out, but could also be due to a build up of carbon in the injectors. I was billed for the injectors being cleaned and my fuel tank filter needs to be replaced as well. Asked Fourways Service Manager to call me back as I didn’t understand how my vehicle could be undergoing repairs that they didn’t pick up, Gave me attitude as to my fuel tank filter was supposed to be changed by Hyundai Bedfordview as that’s where I had my service done and not with them so I should take it up with them and that when I took my car in for service at 75000km with Fourways, they only changed what needs to be changed at 75000km… what nonsense is that when I booked in my car after the service for a diagnostic at your dealership and yawl didn’t find anything and now all these faults are found after yawl had my vehicle for 2 days and you’re telling me to take it up with another dealership!! How?? When you’re the last dealership that had my car? And if Bedford didn’t change anything at 60000km why didn’t yawl change it at 75000km? Or atleast notify my that a component that was meant to be changed at Bedfordview wasn’t done! Instead you want to shift the blame onto other dealers and have me paying for repairs that could have been avoided had you done the proper diagnostics on the vehicle and services done as I believe these repairs are meant to be covered by my service/warranty that’s in place… otherwise what am I paying for?!