Unable to login to Discovery app and unable to claim Vitality Rewards - Rewards are expiring!

For the last several weeks when I attempt to Login to the Discovery App I get a message asking me to Link my Device to Secure my account - however the OTP is being sent to the incorrect number. When I attempt to call the number shown on the screen I am being kept on hold forever on what appears to be a Discovery Bank helpline.

This is completely unacceptable and I expect much more from Discovery!