If you & the instructors believe that an answer is not correct then the Head of Training / CTKI need to take appropriate action either with other Providers and/or directly with their Regulator.
It is clearly not equitable if the incorrect answer is required to achieve marks for a Q.
At least penalty marking for an incorrect response is a distant memory.
M’ learned friends might well sense a feeding frenzy if crowd funding ever got organised. Might judicial review ( or EU equivalent ) ever be an option ?