If I was in your shoes, I would press the MP the reason why they are estimating 2013? Let them know that you appreciate them providing you with a time line however, what are the reasons? If immigration requires each applicant to pay good hard earned money for medicals and PPC to be done and they aren't working diligently to approve within one year, then why not just request that at a later point so it would be less of a chance for expiry and having to pay again! As per their operating manual, their objective is to approve 80% of applications under 6 months. Compare 6 months to 16 months would be deemed unreasonable if you ask a reasonable person in my opinion. If unless there are factors such as criminality, discovery of untruths, etc, then there should be no reason why one's application should be in the pipeline that long.
As for the emailing, you can email them directly to the email address provided in your AOR letter. Ensure you indicate your file number. Based on what I've seen from other ppls feedback, it appears KG is diligent with responding.