If the indirect approach isn't working - ie. through SNCOs and JOs, the best way to get something done is to write to your commanding officer.
The golden rules are:
1. Explain your case factually, accurately and concisely.
2. Politely summarise what you would like done about it.
Provided you follow the rules above, you will not get into trouble and can refer to the letter at a later date - the chain of command also know this, which is why it is likely to result in some action!