Hi John,
We are sorry you have been having problems discussing your record, but, the security is in place to protect your records.
If there is an issue with your date of birth and you have sent evidence of the correct date of birth this will be updated.
In this case we would need to access your record to review.
If you have submitted a letter this will be reviewed and replied to.
You can also try contacting HMRC again in case your record has now been updated:
Income Tax: general enquiries
Thank you.