Billing Method Declined
I have had a Apple account for quite some time now when I got an email to advise me that something has gone wrong on my billing account and that I need to update my details. I have done so, with a copy of my bank account next to me and double and triple checked my information and it is all 100% and yet each time I try to accept the changes I get an error stating that I need to update my details and billing method declined.
What the heck do I do? I have called my bank and my card is active for online purchases still and they are unaware of any issues that could cause this. I really need help.
iPhone 7, iOS 11.2.6