@Ade As you are aware by now, its a fault with the car rather than your household electrics/charger, which often get blamed in these circumstances, as companies don’t want to see fault with their products. Your fault is with the onboard charger charging port or the battery itself.
An interesting part 2 review by Top Gear, who experienced problems, that required a software update, which ironically isn’t available yet!
https://www.topgear.com/long-term-car-reviews/skoda/kodiaq/15-tsi-iv-204-se-l-5dr-dsg/report-2