Frustrating Discovery processes

If you phone Discovery it takes 3 minutes of iva before you can hold on for an agent....then the agent tells you your app is not working because wifi is weak and I need to switch to data...I do this and the app still says unable to load ....try again....its just not working... I'm trying to get a credit (which Discovery insist I must have to book travel on the app)...yet getting this card is very cumbersome...I also don't know why on the app it shows that have 6000 Discovery miles yet if I log onto the banking app my Discovery miles reflects as 00.. As I need vitality I guess I need understand how this bank works and learn to put up with it...very frustrating...