The money is his and it's not like they're not honoring that?
I've learned that if something doesn't work twice with ACH, you try something else.
It may not be easy to open another bank account (if the seller is out of country), but 6 weeks, it's definitely worth trying.
I agree that Amazon needs to fix their stuff, but lumbering giants have like zero motivation to deal with you.
Go to another bank or go to CashApp or TransferWise (now called Wise I think) or any number of the dozens of apps-masquerading-as-banks and get a new set of ACH details. Get the $2,300 you're owed.
This learned helplessness is not helping anyone. There are still regulations, laws and rules that empower you as a consumer and business partner. Use them or lose them!
They've told him what they want: a bank account. So...give them another one? If the author wants to keep spending hours trying to get $2,300 to go exactly where he wants and debugging Amazon's system, he is of course free to do so.
Me, I would have done one thing he did--remove Amazon Pay--and gotten my $2,300 four weeks ago. That's not a criticism, just a difference in tactics.
You're asking the article writer to spend their own money/time by skipping the free attempt to "show the big giant they're wrong and save the next person time".
Personal choice for sure.
Would I do it? Not by choice.
Also fees to file a small claims action are usually less than $100. And you can ask for that as part of your renumeration if you win your case.