I thought some of you may be interested in knowing that contacting Grad chairs (sometimes) works.
I was rejected from a humanities program in February and recontacted the Grad Chair of the department as soon as I received the Doctoral SSHRC and asked to be reconsidered. (S)He wrote back stating that the decision was, in short, overturned; I was admitted and received the formal letters and administrative papers ... And this is at one of the "Big 3" Canadian universities nonetheless!
I would certainly advise to do it ASAP though.