Dont call on monday morning or friday afternoons for one tuesday was always my call day, , they transfered me to the bc cfo, they were to busy so i got one from NB, she is the one that told me never to bother calling monday morning or friday afternoon( in humour on the phone but i got her drift)
patients is key with them, and always be super friendly on the phone with them, being snarky or pulling attitude will get your application pushed to the bottom again