Hi Malise Pang,
To Update your personal details, you can try contact National Insurance directly.
Call national Insurance on 0300 200 3500 from the UK or +44 191 203 7010 if calling from abroad.
You can use the webchat function ‘ask HMRC online’
Ask HMRC online
You can also write in to:
PT Operations North East England
HM Revenue and Customs
BX9 1AN
When submitting your correspondence, kindly provide your National Insurance Number, full name, current address, a contact telephone number, and a brief explanation of the purpose of your letter. Additionally, please remember to sign and date the document, even if it is printed.
Thank you.