Incorrect Advertising and Bad customer Service

I was interested in upgrading my contract so I went online to view the deals available. I currently have an LTE device on a capped contract but wanted to upgrade to an uncapped contract. There is a deal on the Telkom website for an Uncapped Smart broadband package, when I went into the Pavilion Telkom branch and queried about it they 1st told me that the deal was R899 however the website said it was R799, they asked me to return with my ID and that even though I am an existing customer, they could not proceed with my drivers licence and that they needed my ID. I then returned the next day only for them to tell me that the deal advertised on their website is no longer available in the KZN region and that it was sold out. No where on the site is it advertised that the deal is only available for a certain amount of users or if its for a specified time frame. When I asked them about incorrect advertising they said that there was nothing they could do and sent me away. This is very poor service and incorrect advertising.