I don't know where you are or the conditions of sale where you are but here in the UK the first clean is free, courtesy of Canon.

I have heard of this problem before when people have used blowers to remove dust from the sensor. It removes it from the sensor OK, but you have no control over where it lands again, if not very careful or lucky it could well be in your viewfinder. 

The only safe fix is to return to a Canon service centre.

 

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html