@actionman - similar story, except in my case once they had a second certified copy of my EPOA for my elderly Mother-In-Law, after they claimed they never received the first certified copy (more likely they misplaced it), they added my MIL's accounts to my own Netbank login, and Commsec did the same, so I log into both Netbank (CBA) and Commsec with my own ID and password (unique to me) and have access to my own accounts, my MIL's accounts and another trading account I have with my wife. Both Netbank and Commsec also have the option to jump between the two sites directly.
However, in @Saiton's case, he did say that he set the trading account up himself a few years back, so I'm assuming it's under his name with access to her trading account, because they wouldn't have let him set it up in her name, or at least they won't let you set up an account in the name of another person these days and I assume it's been like that for a while.
I have however been completely stonewalled while trying to set up a joint account for my wife and her Mum (my MIL) or trying to get my wife to set it up, because my MIL has advanced dementia, can not sign documents, and has no drivers licence or passport. She was also born in England and despite living and working in Australia for the majority of her adult life, she has never become an Australian Citizen, so with no Citizenship documents, no passport (she travelled over on her husband's passport back in the late 60s), and no driver's licence, she has no photo ID at all, just a birth certificate (from the UK where she was born). CBA and Commsec both require photo ID with the person's CURRENT residential address on that photo ID, and she does not have that. This means that while she can leave all of her current accounts open, and I have full access to those as her EPOA, she can't open any new accounts.
I had wanted to set up a Selfwealth trading account in both her name and her daughter's (my wife, an only child and the only person in the will) , i.e. a joint account, to save money on brokerage fees, and to do some estate transfer planning for when she eventually passes, but Selfwealth need a linked bank account with one of the traditional banks, preferably one of the big 4, and the account name at the Bank has to be identical to the name of the trading account at Selfwealth, so that meant opening up a joint account with a major bank, which, as I said, I can't do because of the lack of photo ID. I've provided her medicare card, utility bills, ambulance bills, and plenty of other documents, but the lack of photo ID issue is always where it all grinds to a halt and can't proceed any further.
It has been explained to me that these new tighter regulations are because of the banking royal commission and because of some cases of financial abuse of the elderly by others, often by their own relatives, and the banks wanting to avoid any liability for such situations by trying to make sure they have their own backsides covered in numerous ways, one of which is making it particularly hard for people to open joint accounts where one party (or both) is/are using POAs.
The advantage of joint accounts is of course that if one party dies, the assets automatically transfer to the surviving account holder. That was something that my father-in-law tried to do before he died, so that all of his shares would transfer automatically to his wife (my mother-in-law), except he had used 4 different brokerage firms and had 4 different HINs and one of those had a single position in it, around $20K worth of BHP which was in his name only, so we had to go through probate to get that $20K worth of BHP transferred into my MIL's name, as he had always intended, and the total cost of the probate process was more than half of the value of those shares.
So it makes sense to use joint accounts to bypass probate and save all the money that probate costs, but the banks are making it more and more difficult to open joint accounts - particularly with elderly people who don't have the same ID options as younger people.
Not much of that has much to do with @Saiton's case, however I just thought I'd share that I'm also having trouble with CBA, albeit slightly different issues.
The Banking Ombudsman (mentioned by @Strawman) sounds like one of the best courses of action to me. Another one could be your local MP or Senator, especially if they aren't Labor, because MPs and Senator's seem to be more motivated to stir the pot when they're NOT the party in power. They likely have more time on their hands also.