Replying to Contacting Canada Post, From the UK!! HELP!!!

Okay so some of you may remember that I asked for the help of newschoolers to help me win a contest. In return for you guys helping me I promised 4-5 people some sticker packs.
I sent the packs out 6 weeks ago, the packs went to Maryland, 2 to England and one to Canada. All of the packs arrived within a week, except for the package to Canada.
I know its only stickers and you guys dont care but I want to make sure that everyone gets their stuff I sent.
I was hoping for an email address to contact them as its kind of hard being in the UK to phone to canada with the time difference and the cost of international calls

+k for help
-k for hate

Simply
people voted for me
I sent out stickers
everyone got them apart from one
i need to contact canada post to see what their gonna do