ICE plan or not, I'm afraid the dealership ripped you off.
That said, it could been simply been due to incompetence. That is, perhaps whoever sold the plan to you didn't understand that EVs don't need much maintenance, and so they sold you a plan priced for one of those horribly unreliable and fragile internal combustion money-makers, I mean vehicles, they also sell. Then again, when it comes to taking your money, I believe dealerships do very little by accident.
EVs need virtually no maintenance (beyond the obvious wearables and consumables that will need replacing from time to time). There are no oil changes needed, no transmission fluid to change, no tune-ups to be performed. There is nothing that warrants $333 per year to "maintain" your FFE. The dealership will literally spend more time counting the money you gave them than doing any work on your car.
Check the manual... the only maintenance items truly required for the FFE are tires, wipers, washer fluid, HVAC filter (all of which are true of any car and, with the exception of tires, inexpensive) and, lastly, replacing the high-voltage battery coolant at 150,000 miles (and this is also not likely not to be a terribly expensive job).