Didn't have this problem with the ski-hire place in the centre of Aviemore a couple of years ago. They were "on the ball" with regards to pricing.
Was about to buy a family pass when the staff enquired about my daughter's age as I was informed that "I didn't have to pay for 5 year olds". As she had just turned 6 a few days earlier and is a "wee lassie" I coughed up being an honest soul

- the price of 2 adults and 1 child wasn't all that much different in price anyway from a family pass.
You should give Glenmore Ski Hire a call and explain the situation again explaining that you have spoken to someone at CGM and also the info on the website. Maybe someone on the forum can give you the name of a reasonable person to speak to at the shop?
Edited 1 times. Last edit at 16.22hrs Tue 26 Jan 10 by WebCT_Guru.