Here is Ameritrade's response when I asked them to restore my dead shares and why they deleted them without any communication:
"I have sent your message to our Corporate Actions department to look into why this was pulled from your account. Once I hear back from our back office, I will send you another message via our message center. I have also asked if we can have it reversed as well.
As for why there was no notification, I have asked our management why we do not currently have a notification system in place or, if we do, why you did not receive a message.
I will send you a message to this Message Center when I find out more information these important issues. I welcome your anticipated patience while I do some research."
Disclaimer: My posts should not be construed as investment/trading advice and is not meant to be a solicitation or recommendation to buy, sell, or hold any securities mentioned. Please perform your own due-diligence and make your own investment decisions.