Impossible to activate a new secondary card on any platform. Extremely user-unfriendly!

Where do I start… got a secondary credit card. Impossible to activate. Downloaded the app only to be told my cell belongs to another account. Eventually figured out they gave 2 id nrs linked to different platforms. Sent a copy of correct id. Waited says for it to be fixed. Tried to activate card again… only to be told on the app i must get a new credit card (which i have). Long story short… many weeks later, many consultants later… problem still not fixed. Not impressed. Now i have an unwanted app, a new unwanted credit card and an inactive second card that is still of no use. And don't try and call… its a fruitless exercise!