why cant I put movies that i've purchased in the cloud storage?
Because it is not cloud storage. It is cloud backup. You need more storage capacity on your iPad, not in the cloud. iCloud backups up your purchases so that you can download them again for free at a later time. You need to make room on your iPad for local storage ... To make room for the movies.
We are not iTunes or Apple employees. You cannot cancel any order here. This is a support forum. If you want a refund, ask here.
If you are in a country that allows redownload iTunes purchased moves you can just redownload them
this lists the countries