Out of curiosity, will you be facilitating them exporting their chat history? Like obviously you see that this wasn’t just a billing error, this was extortion under threat of losing eleven years worth of data.
If you see this massive screwup as just a price issue that can be fixed by lowering their bill, you’ve missed what’s happened here. Your company has entirely obliterated any trust here, and the way to fix this is to acknowledge that and do everything necessary to help them migrate their data to a place where you aren’t holding a gun to their heads.
Yeah, I don't care about some non-profit or whatever. I care that the company thinks it's a-okay to demand from their customers 10x their yearly bill on the spot and to commit to 4x that yearly or else their data will be deleted in a few days. That's not an employee acting out of band, it's obviously their modus operandi.
So if they want to export all of their data they might have to pay you more money to do so? How exactly does that seem fair when they don't agree to the existing price increase?
If you see this massive screwup as just a price issue that can be fixed by lowering their bill, you’ve missed what’s happened here. Your company has entirely obliterated any trust here, and the way to fix this is to acknowledge that and do everything necessary to help them migrate their data to a place where you aren’t holding a gun to their heads.