Erased messages - digital recovery?

Instructions below show how to erase messages - do you know how the messages were actually erased, and if any were not in fact erased?

https://docs.sony.com/release/tam100.pdf

Sorry, the digital memory can't be restored ones the power is cut or the messages are erased. Some high tech lab somewhere FBI/CIA maybe just maybe could do it but no noting we can do about it.

you can try a old trick of holding down the play button for 10 or more seconds.

I'm really sorry.

To erase a message while it is playing, press the ON/OFF ERASE button. The

answering system announces, "Message Erased" to confirm the message has been

erased.

To Erase All Messages: When the answering system isn't playing or recording messages, press and hold

the ERASE button until you hear the "Messages Erased" announcement. Release the

button after the announcement. This feature allows you to erase all old messages

but not new messages. If you do not have any messages, the answering system

announces, "Zero Messages."
User Manual: http://www.home-electronics.net/USER-GUIDES/29875_DOM_EN_AN_IB.pdf

Check your manual for the undelet, or un erase feature. If it doesn't have the feature, you can't get it back, sorry.

Sorry, but once message is erased it is lost.

As long as the xD card was not formatted it is possible to recover the images that were accidently erased. You can go to the following website link and download an image recovery software program that is free of charge.
http://www.z-a-recovery.com/
You want to download a program called Zero Assumption Recovery. It is a very simple program to use and many people have had much success in recovering lost or erased images.

if the messages are erased it cannot be received.its gone.

unplug NOW before someone tapes a messages over the "deleated"one try plugging back to power after machine has had 5min downtime this may 'reset' so you can retrieve if this does not work call manufactor they may know a trick but do not reconnect because if someone tapes over its gone!

Prior to my mom's death, she left me a happy birthday message. Somehow the message got erased. The machine hasn't been used since. Is there a way to retrieve the erased message?

Sorry, there is no way to undo an erased message.