Not Satisfied with the Prolonged Parts Waiting Since July 2023

My brand new 2022 KIA Rio AT/1.4 LS had transmission mechanical problems since June 2023 due to transmission oil shortage (as per the report). It was returned to KIA Tygervalley and since then I have not been experiencing any sense of urgency to repair my car. At this current point in time, I am frustrated and furious with this service. My car has been standing at Mayfair waiting for parts since July 2023. Can the KIA Tygervalley Branch Manager put pressure on this matter? I have been pursuing this matter but no urgency nor constant follow-ups from the Service Manager to the gearbox specialist, except for two email sentences (with no sense of urgency).