Same problem!
I have 18 word PASSWORD RECOVERY MNEMONIC which is NOT a SEED PHRASE
I also have my user name and password from old blockchain.info
The email address is completely lost.
I also have a wallet address which probably does nothing!
18 word PASSWORD RECOVERY MNEMONIC converts to my password that I already know by using
https://login.blockchain.com/wallet/forgot-password (by the way this link recovers only the password and NOT WALLET ID)
Still trying to find a solution to recover the wallet or wallet-id!
Have you tried talking with blockchain.com's support? however, as we can read from delfastTions posts, unless you're prepared to undergo an identity verification, you should probably forget it. Also, I'm guessing the case will still be reviewed after the submission so success may not be guaranteed after.
As for your bitcoin address, do you think it's everything that has some satoshis? cause you could try to check in any block explorer (e.g. mempool.space) to see how much bitcoins are left to gauge how much you're willing to fight for.