Vitality active rewards

Good day, I am very disappointed as I have lost 5 rewards which have expired due to the app not working properly. I have phoned discovery 3 times and they say they will speak to the IT department and get back to me which they haven't. When you go onto the claim rewards, if you click on view reward it throws you out of the app?? I would really like this fixed and I think it's unfair that I've now lost 5 rewards. If someone could please get back to me that would be great. It is the latest app. Thank you Raedene