False Advertising (Disgusted)

I saw a Telkom data deal on the Telkom website, sim card that comes with 7.5GB anytime + 7.5GB night surfer for R249 and it clearly says this is a month to month contract, so I called Telkom and they told me to go to a Telkom shop. I went to a Telkom shop with all the required documents and after waiting for a long time cause of slow service the lady told me Telkom doesn't do month to month contract. This is really disgusting, why advertise something you don't have or do???