I am ready for a phone upgrade - however, when I try to purchase the upgrade and enter my card details, I get a message saying the card details do not match my account. I haven't changed my bank account during my contract, but I have replaced the actual debit card. I changed my direct debit details to the new card, bit still nothing works. It says to update my details in my account but I cannot see this option online or on the app.
I just want my upgrade! Help :(