It's a booklet that is supposed to be supplied when you buy the car. The salesman is also supposed to take you through the booklet so that you understand just what is and isn't covered.
Like you i had never seen it until i was facing a £600 bill
. Fortunately my local dealer is not into ripping people off which is why he covered 2/3's of the work if i just paid for the cost of the parts at dealer price. He could have quite easily said sorry mate not my problem.
If i were you i would ask your local dealer for a copy of the booklet and see if they will speak to the supplying dealer as they will have a bit more clout than you ringing up and getting irate. However i fear 9 months down the line you might just get given two words. The first one will start with F & the second will end in F.