MTN's free 20 GB anytime data, once-off is a lie

MTN claims that it's deals come with free 20GB anytime data. I just upgraded yesterday to myMtn choice 80GB data package. In their Y'ello magazine it clearly states that the package comes with the free 20GB. After activating the package, MTN didn't credit my account with free 20GB. I called the customer service and all agents dropped my call after pretending to be helping me. MTN must stop playing with people. They must credit my account with the free 20GB as they claim in their Y'ello magazine. People must be aware of this misleading and and false advertising that is just intended to lure customers. People must know that the free 20GB punted by MTN is just a **** to mislead customers. The contract cellphone number is ***.