Air Canada Flights Info? ie MULITTRIP, CANCELLATION and INCREASE Price per hour

[PLANT]

Trying to find the guy on here that put me onto EXPENSIVE AirCanada...but get there in one peace.
First time booking and flying with them and getting my Singapore FF
Booked online and then rang HELP number informed of MULTI-BOOK is a cheaper way for multi flights! DOH!
Discovered that can cancel and full refund in 24hrs!
Fares increase online on the hour!

Anyone want to add info please....found expedia.com will not give cheaper AC fares...not listed.

Making purchases with AIRCANADA.com, can I put my residence as a hotel in USA?? as the cost is cheaper than saying I live in Australia.....mark up conversion by $10-$20!!!!!
Will it allow transaction through or stop it?

 

[PLANT]

Bugger this lot.....Cancelled my flights and booked via WESTJET...no SIN FF points but hey it's cheaper and get me there!
Major issue is there CONTACT number from Australia DON'T WORK?
No MULTI-TRIP booking either
Still cheaper though!