I believe the tech management team will not run this up the chain of command because they'll have to admit they created a major, unnecessary problem for their primary customers. I know accounting professionals who have stopped recommending Quickbooks to their clients. Tech would look bad if they confessed to what they've done. A reversal of their decision would harm egos. 

This has been a miserable experience with ridiculous timing and there's no worse feeling than being ignored. 

They know what they need to do.