Healthy Food Card Fruatrations for a Month and a half

I have been struggling to sort my PnP Healthy Food card for more than 6 weeks. I ordered and re-ordered cards. Early this week I complained again. The next day I received 4 cards in the post, dated differently as I re-ordered over time. Great job SA Post Office. Then an agent responded to my latest request for a card and issued me a new card number and yet another card in the post. My question: Can I use the cards I already received? This is so frustrating..... Why is Discovery Vitality so cheap skate that they can't use a courier? Please respond to me this time and not my wife.