If you really don't think there is any way to approach this besides the grievance system, I think you should talk to your Pl Comd/Officer and WO and detail what has happened to date.
IF there is nothing you can do in the CofC at the "lowest level possible", and you really want to pursue a grievance, I strongly suggest you start with a "Notice Of Intent To Grieve" to your CO. Its not avail on the Internet site, but it is in the DIN/DWAN. You will see its intent when you read it.
Technically yes you can submit a grievance but it really should be a
last resort. If you talk to your Platoon Comd, Officer, they can go to their next immediate superior, talk to the right people on the NCM side of the CofC, etc. You can submit it via memo as well, starting a papertrail.
Not knowing all the details, I still suggest this, and I'm speaking for experience. Try the CofC first. The NOI will let your CO know you are planning on submitting a grievance, but haven't yet, what it is about, etc. It will also be a last attempt to resolve your contention at the CofC level. Once you submit a written grievance, the process is pretty formal (CO must register it in the CFGRS, etc). It is also likely going to take longer and might make you a target in some peoples eyes.
Read this stuff first (link below), but realize that for whatever reason, the DIN/DWAN DGCFGA site has more thorough info in it compared to the InterNet one.
InterNet Director General CF Grievance Authority Site
Also, remember that
asking to go on the Mods doesn't mean that you are going to get them. Your Unit might have been given 10 spots, and you are #12 on the list, if you follow me.
Based on this being something you asked for, not told you were getting or whatever, I'd recommend leaving this inside the CofC, I personally don't think a grievance would help you.
:2c: