Error in price of toilet paper

Highly disappointed with your service. Clicks is a big retailer and as such we have high expectations for you. Your black Friday pamphlet states deals start from the 26th of November till 4 December and on left hand corner there is a square with deals dated offers valid from 25 November till 4 December. When I get to the till to pay for the 2 ply 18 rolls of toilet paper ( which are on the offers valid from 25 November till 4 December) I was told by both the manager and cashier that the price is R99.99 per pack and not R84.99 as advertised. The pamphlets are still stacked at your entrance and it's bizarre that Noone has picked up this error. Highly unprofessional for a large retailer like clicks !!do better