Halifax review: Online banking

I have been trying to resolve this problem for YEARS! I was locked out of my Online Banking when Halifax introduced new security measures years ago. The secure ACTIVATION CODE is not being delivered to my Correspondence Address. I have over the years been into branches, called in, contacted your social media teams etc and there does not seem to be a workaround. I have updated all addresses and phone numbers and prompted the activation to be sent to my correspondence address via the web and app log ins and from a teller in the branch. Without this I am STUCK. All I want is to move my money from the Savings account it is in, earning little to no interest, into an interest bearing Fixed Deposit type investment to earn the 5% on offer. In essence, I want to LOCK the money up tighter so clearly am highly unlikely to be a fraudster! I have been in a branch with multiple forms of identification and I cannot INVEST the money in MY account without this code. I am beyond my wits end at the amount of frustration that this process has caused, let alone YEARS of lost interest and the expense of phone calls and branch visits. I have complained on every format and yet to get a response. I have literally just tried Online Banking again and now get the error message "We can’t send your activation code in the post." WHY? I get all my statements and your marketing garbage to my Correspondence Address, why can I not get this activation code that YOU seem to think is VITAL?