@aral For me it was when they asked for my most recent bank statement from my current account with a different bank, which I provided, then they said “no your most recent one” and I said “yes, this is my most recent one, I get them every three months, this is the most recent one, here’s a screenshot of my bank’s website showing that this is my most recent one” and they said “call your bank and ask for the most recent one” and I said, again, “THIS IS MY MOST RECENT ONE”.
I’m pretty sure that BOI do their statments quarterly too so I don’t know why this was such a difficult concept for them.