Yet another FNU issue

[mt_999]

I will be applying for my green card and I want to get rid of the FNU before it is too late.

Desired Name

[First Name] Natraj

[Last Name] Srinivasan

In Passport - Given Name

[Given Name] - Srinivasan Natraj

[surName]- blank

In my H1 Visa It got changed to

[Given Name] - FNU

[surname] - Srinivasan Natraj

SSN my names got interchanged

[First Name] Srinivasan

[Last Name] Natraj

I am not sure where should I start with to get this corrected.