My first choice would be Mastercard.
Why did my transfer fail? Why is the exchange rate wrong for my cash withdrawal? Why was a fee charged for my transfer? How do I use Apple Pay or Google Pay? What should I do if my card is about to expire? What is the charge for topping up by card? How do I get a virtual card? Why is my transfer pending? How do I order a physical card? What is the timing for transfers? What should I do if my card is compromised? How can I exchange currency via the app? Why is my balance not updated after a cheque or cash deposit? Why is my contactless payment not working? Why is there an extra charge on my statement? How do I activate my card? Why has my transfer not been received by the recipient? Was my card payment reverted? Why was my top-up reverted? What are the limits for disposable cards? Why was my card payment declined? How do I verify my top-up? How do I link my card? When will my card arrive? What are the top-up limits? What should I do if my card is swallowed? What should I do if my card is lost or stolen? How do I request a refund? How do I change my PIN? Why did I receive the wrong amount of cash?