The battalion might be going through some staffing transitions, vacations, etc. I know our ROO told me he has a very busy summer having to go to a different school almost every day (he has a number of schools affiliated as cross-town campuses) for orientations, visit days, etc. Keep trying.
I am surprised as the cadet my DD did overnight with has been so helpful to her in terms of what to bring. Did you meet an ROTC student when there on a visit that you could contact? If not, could you go onto the school's Facebook page to find one?
Some things my DD was told to bring are: excellent running shoes, plain (no logo) white crew or quarter-cut socks, thicker socks for boots, plain black or gray shorts and t-shirts for PT to use until you are issued your own, and a plain black waterproof sport watch, for females hair pins and pony holders that match hair color. My DD also opted to get more comfortable and better quality boots than the ones that will be issued, though this is optional - we went to nearby army base to be certain they would meet regulations and to check fit/comfort. I have seen posted that many students agree this is helpful, especially for those who have feet that might be fussy, sensitive, and/or hard to fit properly. I hope that helps!