Clicks 3 for 2 specials

Today I tried to purchase 2 face products on Clicks 3 for 2 specials. That is a foundation, a blush and a mascara. All good until I arrived at the till to be rather rudely told that the mascara does not count as a face product, it counts as an eye product. Please Clicks can you be more specific about what constitutes a face product so that I am not embarrassed at the counter again. I would like to get a reply from Clicks.