Cancel it through your bank. Simple call will do. Call up Redwolf and tell them what is going on and you'd like to cancel their order.
On top of that I believe Red Wolf is a retailer that automatically declines orders containing guns going to Canada. (So I've heard, but not confirmed) They are also aware of the restrictions in Canada as listed on their website
"In short, importing airsoft guns into Canada requires either a firearms license or a movie prop license. If you have neither of these, then you can only order accessories from our site." - RedWolf Airsoft link available here