Service display cannot be reset despite confirmation!?!

Hello and good evening, for my brother I present a problem here: It is a Leon BJ. 2013. How to reset the service display, we know: 0.0 button and ignition etc. We also come to the menu and have confirmed the query to reset and the confirmation message “Service interval reset” appears. But at the next start nothing is reset, it appears again: Service in xxx Km or 3 days due. Also the variant with warning blinker and 0.0key we have already tried. We are perplexed. Does anyone have an idea? Greetings Sven