I think my next move would be, requesting a partial refund of the pack price or you will complain to the Motor Ombudsman.
It needs comparing to an equivulent Enyak, if thats the way they want to do it (which can’t be right) not a different model, such has the Mk3 2015-2023 Superb. Are you sure they disn’t fob you off with 71 plate Superb actually having standard system.
What Skoda dealers are near you, preferably from a different group?