National Insurance Number Fraud

A few years ago I had a discrepancy with my PAYE, it looked like someone was claiming to be me and working under my NI number and after a lot of phone calls back and forth to HMRC it was put down as a mis-matched NI number and I was told it was resolved. I haven't checked my personal tax account for a while and my log in details had been deleted so I had to go through all the process of creating a new one and confirming my ID - now I have logged in I can see that again someone is still using my details to work and even the address on the PAYE record is not my address. So it is clearly not a mis-matched NI number someone is clearly committing fraud in my name. What are my options now? Can't get through on the phone to HMRC - do I contact the police? My oldest son is applying for Uni and these PAYE record will reflect on his student finance - I need this resolved once and for all.

Hi,
If you could call our National Insurance Helpline on 0300 200 3500 then they will be able to make a report to the Team that will be able to correct your National Insurance account.  
Our telephone lines open at 8am and it’s usually easier to get through as early in the day as you can manage.
If you aren’t able to get through to us then please write to us and we’ll correct your National Insurance account.  
Our postal address is:-
HM Revenue & Customs
PT Operations North East England
BX9 1AN
Thank you.

Hi, someone saw my national insurance number and I don't want them accessing my information and using it for anything, what should I do?

Hello, I just received a phone call that my national insurance number is compromised ,requesting me to Press 1 to confirm what seems unclear to me. Anyway,I do not Press 1. Please,how do I confirm if my NI has been compromised. I have made several calls to HMRC but to no avail. Thank you.

Hi,
Unfortunately, you seem to have been contacted by a scam pretending to be HMRC as we would not contact you via an automated service.
You should block the number through your telephone provider, if the call was received on a mobile device then you can report and block the number as spam. You can report the call here:
Report suspicious HMRC emails, text messages and phone calls
You can look at your National Insurance record online through your personal tax account to see if you have anything held on the record that is not familiar.
If you do not currently have a PTA you can set one up here:
Personal tax account: sign in or set up
Thank you.