Sorry I have no control of the automated upgrades that are sent, I am in US and unable to make long distance calls...
If have tried different charge cables, outlet and tried hot reset process without any sign of life, then the Kindle time as passed and yes time to replace with a new one.
I realize that the answer provided may not of been entirely to your liking, and I regret being the bearer of information that you really don’t want to hear. But it would be unfair to you and unprofessional of me were I to provide you with anything less than truthful and honest information. I hope you understand and found this information useful to save you hours of frustration.
Here is link to some replacement Kindle devices : http://www.shopandship.co.za/Amazon & also note the you can install free Kindle app on your computer or smart phone as well, see https://www.amazon.com/kindle-dbs/fd/kcp
Please note: This is an independent 24hr online paid assistance site, where independent experts in their field from across the globe, can assist you for the agreed upon fee, all in the privacy and comfort of your home. We are not paid a salary, are spending our personal unpaid time to help you and are only paid a part of your question deposit when you give a smiley face / star rating of 3 or higher for the timely professional advise provided.
Thanks for your patience in troubleshooting and looking into the matter together. Hope otherwise having a good start to the new year and get a great replacement ereader soon.