False advertising

If you have a special on the Vodacom app, is it not false advertising if I cannot purchase what is shown due to the contract I have? I fount a special under red hot deal and selected it. After a lot of struggling with the app, I finally managed to add the recurring data bundle at a discount of 80% to my monthly bill but it shows nowhere. Upon calling customer care and them checking my account, I was then informed that I am not allowed to add recurring bundles to my account even though I had this before they migrated my contract due to changes Vodacom was making on the package I had. Surely these specials should not show on the app if I am not liable to purchase them or add them to my monthly bill! Why give these options if they not available? If only there was another service provider to use in this country that didn’t give issues! Been a customer for over 20 years but Vodacom doesn’t care as long as they making money