Ok so this is the response I got back from Blockchain:

Hello,
 
As we wrote, unfortunately we are unable to help recover or reset passwords. This is not a matter of policy but simply that it is impossible for us to reset a wallet's password due to the way the file encryption is designed. Please try every possible password combination you may have used.
 
You can use the legacy mnemonic to reveal the password at the time of recovery phrase creation here,
https://login.blockchain.com/wallet/recover-wallet  Keep in mind the mnemonic recovery phrase only reveals the password at the time of phrase creation, if the wallet’s password has been changed since the recovery phrase was created then the information it provides may be inaccurate and out of date.
 
The older version of our wallet has been discontinued. This transition period was ongoing throughout most of 2016, and now upgrading your wallet to the latest version is required to access funds.
 
Wallet.aes.json backups can be imported here: https://login.blockchain.com/wallet/import-wallet . Please note, this process does require the correct wallet password in order to decrypt the file.
 
If you do not have the correct password or an accurate recovery phrase, then access to the wallet and any funds it may contain has been lost.
 
You can read more about how our Blockchain digital currency wallet works - https://www.blockchain.com/learning-portal/how-it-works


So I've sent a total of 18 emails so far. On virtually all of them I have spelled out that I have the ID, password and mnemonic code. Yet his first line is "As we wrote, unfortunately we are unable to help recover or reset passwords"

I am losing the will to live lol.

I am thinking that maybe the email change has something to do with the transition of the wallets in 2016? I have no idea. All I need is for them to change the email back to the original one used for the set up.

I just can't believe the ineptitute of the helpline staff. Should I just send a message to their complaints line at this stage?