Misleading info on website and *********** sales dept

Vodacom has a red deal of 50GB + 30 GB for R299/month. I app**** online and then it comes to the end and say an agent will call me. I get the call from them and then they say no this deal dont exist but it is on their website. She then say she will contact her manager. Do they know what they are selling ? When you apply for the deal they dont show you the full GB on the website. Are they misleading the consumer or what ?