Why can't I update my itunes account info?

I attempted to make a purchase of a TV episode on itunes and because this is the first time I’ve used my Apple ID on my Macbook air it won’t allow the purchase until I confirm my billing information despite that I’ll be using $10.17 I’ve still got from a gift card I redeemed at the beginning of the year.

I’ve moved and replaced an expired debit card since last using the account but am unable to submit the necessary changes to my information as it claims to not match my bank records. I’d changed my bank account to reflect my new home address before I even left the previous (It was my grandparents house so it was already ours just in renovation) and a notice unexpectedly appeared by SNAIL MAIL at the address informing that it had been processed. I’d then activated my replacement debit card the moment I received it in September.

So there is no logical reason my “bank record” whatever that’s even referring to should not be reflecting the information I’m trying to enter into my itunes account.
What can I do?