Samsung SA do not honour promises

My dad got a new Samsung Galaxy S9 in May. We registered, and ordered the free Dex station and 128GB memory card on the same day, via the Rewards app. To date, we have not received it, emails to Samsung are unanswered, and the time for the offer is running out. Between them and Vodacon who sold us the phone, on contract, it's hard to say who is the bigger ****, as Vodacon absolves itself of all responsibility, even though they are the ones who marketed and sold the phone to us!