Want them to really listen to you? Cancel your accounts - move to another bank.
This works well as a bluff, but of course you need to be ready to follow through in case they call the bluff. Which if you are, you may as well switch banks for real anyway.
> Want them to really listen to you? Cancel your accounts
Just loop in your regulators. This costs them far more and properly documents the problem for follow-up in case it becomes a pattern. Possibly more annoying than moving accounts. But far more effective (unless you have nine figures with the firm).
Cancelling costs them no money — banks these days don't make money on customer accounts.