I wish I could make it better, @Angie3124.
Currently, we have an on-going issue where users, like you, are unable to change the bank routing number for payroll's direct deposit processing. Rest assured that we've already informed our engineering team and they're in all hands working to fix this as soon as possible.
Even if you've already reached out to our Customer Care Support, I'd still recommend contacting them as they haven't shared a workaround yet. With their tools, one of our specialists can associate your account on file to the said investigation so you'll receive all updates via email message.
Lastly, I've also included this helpful reference for a compilation of articles you can use while working with us: Help Articles for QuickBooks Online Payroll.
We appreciate your patience as we're working on this, please let me know in the comments if you have any other questions. Stay safe!