Ignition coil already at about 30,000 km defective

The ignition coil of my Opel Mokka X , 1.4 automatic , year 08.2017 is already after almost 30,000 km defective and has been renewed with new spark plugs. Price Euro 700,00 incl. installation. The car dealership (Opel) advised me not to apply for a certificate of conformity, as I omitted the inspection 2021. From 08.2000 to 08.2001 I did not drive even 4000 km due to the Corona situation and therefore found an inspection unnecessary. My warranty extension for two years, was of course also in August 2021 from of course they don’t want to help me (insurers). The vehicle also showed no clues in the driver infotainment. Does someone have an idea or an experience worth, how one can motivate the manufacturer nevertheless to a cost participation for this more than unusual repair ? Thanks for every answer and greeting from Sylvaner