This one case seems very good to refer to the CIC Case Management Branch which I read of and earlier noted, case-review-im-enquiry @ cic.gc.ca. This department handles special cases, issues where litigation are possible and visa office screwups (I want to say something else but lets keep it friendly). They also handle cases where visa office doesn't respond within 30 days. I'm sure you have written to them without avail, write an email explaining your situation, attach all things related to this matter including emails/faxes and CC Islamabad as well.
Good luck...