Thank you for your question.
Parastatals are typically large, interesting and complex beasts that take a long time to react to a new world that is changing very quickly. Being large, they can come down on you with a lot of force. Being complex, they have systems in place with which to function. They are interesting as they don't always work as one would expect in the private sector.
Should you keep quiet? Probably not. Should you kick up a storm (once again)? Probably not.
You are in a trusted position working with and knowing peoples' salaries, probably the most contentious area in any business. If you use that information against your superior, I expect that you will break the trust, and also upset them as they are also part of the system. If you examine your case in terms of benchmarks, is there a measurement that you can use to justify an annual increase? If not, is there a procedure that you can follow to justify it? If you can, you give your superior ammunition to help them to fight in your corner.
If you kick up a storm, your superior might say, "oh there he/she goes again".
If your once-juniors are in management positions, keep in mind the added responsibility and stress that accompany their position, which you don't have.
You cannot (should not) really compare your situation with theirs.
Benchmarks: What are other in your position now earning in public and private companies?
If you were to leave where you are, would you be able to get a job somewhere else?
What other benefits are you getting, e.g. medical, pension, job stability, education/skills/training budget?
Summary: Can you help your superiors to come up with a solution? If this issue is big enough, I think that you will put in the effort to make that happen.
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