Good Day I have a issue of the car Renault Kiger 2026 brand new bought it on January 2026 and have issues of misfiring since june 2026

Good Day I have a issue of the car Renault Kiger 2026 brand new bought it on January 2026 and have issues of misfiring since june 2026 . Reported the issue to Renault and they took the car 3 time but keep saying they cant see anything or the lost the job card . Please assist I am so frustrated. I hope to hear from you soon. Kind regards Anathi Madaka ***