About a year or so ago i also changed bank account (or at least tried!) but AZ was throwing up all sorts of issues for the IBAN number I was using for verification of the old account. Im with Barclays and they have a webpage where you can auto-generate your IBAN number but for me this just wasn’t working. So after 3 tries i too got suspended etc. After many calls to CS they couldn’t work it out either, so eventually they actually put me through to the verification team. I spoke to an Irish lady, very helpful indeed and the issue was that the “new” IBAN number didn’t match the IBAN number that I initially signed up with when i started with AZ. She explained that she used to work for a bank and that banks regularly change their IBAN codes, so what i had to do was to locate the original PDF file that I submitted years ago and i was to use that number, not the new IBAN number. I found the original PDF scan…plopped the IBAN in from that statement and hey presto…acceptance! She said it happens all the time and that AZ really should sort it out!
Now then, about a month ago I changed banks and thought ‘here we go again’, but I tried the new IBAN and it worked first time! What joy!
Sadly you said that you can’t call them now, it’s obviously changed again! I hope you get it sorted though.