True.. You must keep in mind the fact that this is their Buisness. Im not saying that there is no such thing as a Good Consulting company. But I strongly prefer you to seek guidance from different forums instead if you have any confusion. Consultancy will not only cost you money, it on the other hand is not in any sense a 100% Visa success gaurantee.
I assume if you are planning for studies from Canada, then obviously you are educated enough to compile a visa application. Do so and then let God's will prevail. Have Faith.