My details not recognised on tax site

I am providing correct First Name, Last name, DOB and NI number but the tax site doesn't recognise me. I have never changed my name. I raised an online ticket and I was then directed to call 03002003300. They ask lot of details but disconnect the call in the end. I have been paying NI for last 12 years. How can I get access to my tax account?

Hi,

If you have entered the correct details but not are not recognised, then you will need to contact our Income Tax team to review this for you.

Income Tax: general enquiries

Thank you.