Is there a way that you can save extra copies of all the correspondence that you get from the National contact? That way if the Greek Life Advisor claims that they never recevied anything, you'll have extra copies
Like Jocelyn said, it might be a hard sell getting a MCGLO on a HBCU. Maybe you can met with the Greek Life Advisor and discuss how this new GLO will affect the excisting ones. This way you get to hear (hopfully) the fears and concerns the GLA has about bringing a new organization to campus.