Discovery's misleading adverti*****ts.

How is Discovery Vitality able to advertise "achieve your goals and get Netflix voucher for the price of a a coffee" (or 150 Discovery miles) and then change the conditions as it pleases them? Their adverti*****t said it was valid for April May and June. 2nd week of May and no more Netflix reward voucher. All of a sudden on the website they advertise, "In April we offered you Netflix and this month its a Exclusive Books voucher valued at R250.00 (for 150 Discovery Miles). Can this not classified as misleading advertising.. you promise one thing and change as it suites you. I think the response was overwhelming and more than what was anticipated but you cant change your commitment, to suite you after the first month. But we grown accustomed to Discovery's way of changing the rules to suit them. They draw you in with the promise of more rewards/value but when they must deliver it is always a problem and you have to show then where they have faulted. I dont believe their marketing campaigns anymore. P.S I have copies of the adverti*****t where clients are promised 3 months Netflix voucher.