Itunesu using maximum battery

well i had subscribed to few courses on the itunesu application. Had queued 20-30 videos of those lectures for downloads. Suddenly realised the video were 800mb approx. This high data traffic cannot be afforded in country like india so i deleted the courses (PS but not the downloading lectures). Now all my wifi is still downloading the videos. Sometimes i get failed video download. I tried deleting the application but the problem is still there. Video downloaded shows under podcasts on the itues application. i have to delete from there frequently.