False adverti*****t and *********** staff

On the 9th of June I went to Cell C at Canal walk to get a sim data contract. On the pamphlets the data was advertised as R279 for sim only option as well as the option of getting a router deal ( deal lasts until 15July). The sales consultant who helped me confirmed that was the actual price and I signed up for the contract successfully. On the 30 of June I went to the same Cell C again with my boyfriend who also went to get the same contract and this time around he was assisted by a different sales consultant who informed him that the price for the deal is in fact R301 and not the stipulated price on the pamphlet. We both battled to understand why the price was different and I asked the sales consultant to check my details on the system as I also had the same contract. It appeared that my contract was also R301 instead of the R279 that I had originally signed up for and the sales consultant who assisted me was not in store at that time to explain to me. I called him and he was adamant that the monthly bill is R279 however on the system it still shows R301.Other than this false adverti*****t which I feel is absolutely unfair I am also utterly disgusted on the service I received from him because upon my visited on Cell C on the 30 of June, I realised the amount of mistakes that he made. He registered the wrong physical/postal address and he didn't register my email address. So had I not visited the store by chance I would not have gotten my invoice.