paid NI on Medical benefits in error

My employer set up my medical benefit which was being payrolled as a taxable and NI able element. Therefore over four years i have been paying NI on this in error. My employer have done earlier year updates for each of the affected years, for myself and the other employees affected by this, but as yet we have not heard anything about it being refunded. When the employees phone the employees helpline it isn't visible, and when our employer rings their helpline all they can say is that the annual totals have been updated. The earlier year updates were done in October 2022.

Hi
If your employer has payrolled the medical benefit in error, and have subsequently completed FPS amendments to correct this, they are responsible for refunding the overpaid NI to their employees.
The FPS amendments create a refund on your employer's PAYE account by reversing the previous liabilities declared in error.
As your employer had deducted national insurance and paid to HMRC at that time, the reduction in liability, creates an credit.
The employer can either offset or claim back the refund from HMRC.
You should speak with your employer in order to get the refund back.
If your employer requires any further assistance, please ask them to contact the Employer Helpline on 0300 200 3200.