Online National Insurance Record Incorrect

My National Insurance record shows 1980 to 1981 Year is not full, National Insurance credits: 1 week. I was in full-time employment from Spring 1980, this year should be a full year, in the past this has show as a full year. I do not have any payslips or P60 for this period, how can I get this corrected?

Hi Jeremy,
Please contact our National Insurance helpline or webchat, an advisor will investigate the tax year 1980/81 and take the relevant action.
Please find the contact details below:
National Insurance: general enquiries
Thankyou