When we were approved for sponsorship, I've joined a discussion forum to share concerns with others also waiting for their visa. Everyday, after checking on E-CAS, I regularly check the forum to help me ease t he waiting dilemna. Today, I found out that I can send an email for inquiries not found in the Canada Immigration Center -> firstname.lastname@example.org but they usually take 1 week and half to reply.
After I sent my inquiry on taking the medical examination again because ours has expired last August, I received an SMS telling me that a letter from the embassy arrived - the advise to take the medical. That was quick, WHEW!