[ChuckMcM]

A lawyer could advise you. My guess is that getting a registered receipt for certified mail addressed to their general counsel would be sufficient evidence for the courts that you had notified them but your lawyer will know better than I do. I have occasionally resorted to sending certified mail with receipts requested and if nothing else it sends a message that I'm serious.

It wasn't my idea though, the last time I got into a dispute with the IRS they did that to me and I thought "hmm, I bet they do that to 'prove' you knew what they were asking of you."

That said, I'm really sorry you have to go through this. More and more I've been working to move off Amazon ordering for this exact reason.