I am not able to locate my Ni and cannot pass my phone check

HMRC has a wrong NI number against my name which is different to my actual NI in payslips. I am not able to pass the phone verification as the agent cannot verify and cannot proceed. How do I contact HMRC to resolve this issue. I need to register for self assesment.

Hi,

If you are unable to pass security on the phone, please write to us confirming your correct details and the two NI numbers.

Income Tax: general enquiries

Thank you.