Column AP. Click column Z, hold shift, click column AR, right click, select unhide. You guys can release 1.
At this point, I would say you're out of luck, especially if the RVP says he can't do anything for you. To be honest, I don't know what type of outcome a grievance would accomplish because it's not directly linked to one individual. It would, however, shine a light on your ATM for not doing his job, but that's little consolation for you guys. That sucks man.
If you'd like to forward to your ATM, the SWB portal is located here...
https://aapasp2.faa.gov/portal/page/portal/ATOApplicationPortal
...and the ERR SOP states this...
3.1.1.The staffing workbook will be updated continuously by field air traffic control (ATC) facilities.