While we don't have the option to undo the sales tax return, I'd suggest contacting our Phone Support Team. One of the agents will check on your account in a secure environment and help you undo your sales tax return from there tools.
I will contact support to try and get the problem solved.
Just a comment. Why was I told to follow two different scripts when NEITHER of them is possible - "we don't ahve the option to undo the sales tax return..." Instead I'm told to follow two different procedures neither of which was possible.
Thank you to the folks trying to help. It's just frustrating to have an "answer" that wasn't possible. Should I have asked my question differently? Is this a case of the "old" sales tax system vs the "new"?
Further comment: The "new" sales tax system is not helpful at all.