Woolworths not honouring advertised promotions

Today I went to Woolworths Welgemoed to buy their 2x 2 liter ice cream for R100 as advertised in the newspaper and on their website. In the freezer isle there was a shelf talker clearly stating mix and match any 2x 2 liter ice creams for R100. I decided to go with Stracciatella. When I got to the till, the total was R134.95, I questioned this. The lady at the till first told me it was only the one variety that was on special, she later called the manager whom assured me that I am wrong. I kindly pointed out that this was advertised and his response was only the mint ice cream is on special as advertised. I refer to the Woolworths website - [URL Removed] this clearly shows that the lady at the till as well as the store manager and completely unaware of the nationwide Christmas promotions their company is currently running.