NI number fraudulently used

My NI number is being used by a very obvious fictional company. I have contacted your fraud line, your HMRC line, your NI line, UC, action fraud etc and no one will help, I’m just advised to ring someone else. I’m not the only one, I’m aware of hundreds this is happening to so there has clearly been a data breach somewhere. Could I please have contact details of someone high up that can take responsibility for looking into this issue.

Hi,
We apologise for the level of service you have received.
Please contact the NI registration helpline on 0300 200 3500 and one of our advisors will assist you.
Thank you.