I’ve neen swearing profusely, but in English. Maybe I should try in the hob’s native language.
Sorry I can’t help I’ve had the same problem recently
Ended up eating a lot of toast
I know for sure one day appliances will be the death of me 
I hope you have solved it by now.
I have no idea what model it is but perhaps there’s one specific button that you don’t know what it is, that might be the child lock. The ones I know usually take longer to deactivate than the other buttons. For the other buttons a slight touch is enough, while the lock one needs to be touched for several seconds perhaps even 10.
Years ago I sat a home with an induction cooktop. I figured out how to turn it on with no problems but all of the pots were handle-less. It took me 2 days to discover that there were 2 detacheable handles to be used on all of the pots!
All sorted now, thanks to a teenager in one of the other apartments in the block. There’s a sacred ritual that I wasn’t following precisely enough.
But you can’t leave us in suspense! Please tell us what the sacred ritual is - it could be a lifesaver to some of us in the future 
!
I recently had a screwtop bottle where the top would not separate from the bottom part (which was too loose so you couldn’t grip it). I googled and found it’s a common enough problem that it has AI advice specific to that wine.
SAME! 
Nice to know I’m not the only one 
Some RV and camping pots work like that, too, for weight and limited storage reasons.