False advertising

********** 750 refers. I responded to an advert offering 20GB of data (10 daytime and 10 night surfer time) When the package was delivered and registered online I found that only 5GB day and 5GB was loaded to my Sim card by Telkom. Numerous messages have been sent to the agent that advertised the deal and all he can tell me is that Telkom made an error, it happened to many people and it will be corrected. He cannot tell me when. When I asked what will happen if usage goes over the loaded 5GB he told me the device will stop working. Not off a very good start ... I would really appreciate if Telkom could fix their error and give me what I signed up for.