After having 3 Phase meter for 34 years it was replaced by a single phase smart meter, we now have a 3 phase cook top and the costs to get it connected are prohibitive!! Why should this be so?
Your best bet here is to speak with the company who installed your meter. They'll be able to give you more info on your cooktop connection and digital meter.
Sorry I couldn't give you more info - would be great if an engineer or installer could jump in here!
Let us know if you have any further questions.