Air Canada is still hide bound in snailmail and fax for customer service. They do not have online forms nor do they give out e-mails. I sent a complaint beginning of the year and they finally got back to me 5 weeks later.

Your best bet is Fax and the fax number should be on the website. I used to be exclusively AC and have been status for severs year but have hedged my bets last year by getting Elite status with NW.