A mistake

Dear Canon,
Last week, I bought a digital camera from your store located in Curitiba. When I open the box, in my house, I realized that the camera came with a wrong battery charger.
Three days after I went to a store, talked about what had happened and asked to change the battery but the store refused to correct the mistake.
I have my credut card bill proving the day I bought and the garantee. I would like to solve this problem without complained for the factory but the store sad that they can't do anything, them, I would like to receive the right battery in my house quickly because next week I'm travelling.

Sincerely
Marina Piazza
Curitiba