6 weeks of following up but still no outcome

My son is insured on the young driver benefit. I confirmed this when we agreed to the policy in October last year. After the prescribed 6 months had passed I contacted Discovery Insure to find out when he would be receiving his reward of 25% of his premiums. They advised that I had not asked for this cover and after disputing it agreed to check the tape recordings. They concluded that I had in fact asked for it and they were in the wrong for not capturing the policy details correctly. I was advised that the matter would be rectified within the next few days. Two weeks later I established that he would be sent a rewards card in the mail which he could activate via sms and then use the funds for whatever he chose. We received the card and sent the sms but did not receive the pin number back. I have now called the Insure call centre a total of 6 times and dealt with 4 different people and yet still nobody can tell me why the card cannot be activated!! On top of all of that they advise that I have to wait until the end of June for the next pay run for the money to be loaded - which is utter nonsense since I've already waited over a month for nothing to have been resolved.