So I replied to them in a more stern manner this time and once again asked for the email to be changed back to the set-up email. This is their response:
.......
So now I have no idea what to do, I guess I try their complaints line?
I would simply write them something like this:
Hello there,
I have an email address that I used in 2014 (15,16?) when I first registered my wallet in Blockchain.info. (__@__. ___) (If you remember the exact date of registration, you need to write it down).
I also have the ID of this wallet ___-_-_-___
I know the password I used when registering this wallet.
The source file of this wallet Wallet.aes.json of this wallet was not copied and saved by me in a timely manner.
However, I believe that an archived backup copy of my wallet's Wallet.aes.json file was saved by your service, since according to your public document (https://www.blockchain.com/en/learning-portal/how-it-works/):
"We've Got Your Back(up)
“Your encrypted wallet is automatically backed up to our servers. To safely store your wallet, we add another layer of security by encrypting your wallet a second time. Securely storing your wallet on our servers ensures that you can access your wallet from any (and all) of your different devices.”
Based on the information presented above, I ask you to send to my above email an archived backup copy of the file Wallet.aes.json of my wallet ID __-_-_-___ (dated 00.00.2014(15)(16?)
Best,
And very interested to see what they answer.