I was ripped off!
 

I saved up some money and yesterday I had found the spell I wanted, small lightning. So I go to the store to purchase it. After I purchase it, and read it, i decided to go kill a monster or two. I tried casting my spell on the monster, and nothing happened. I checked which spells I had, and I only had the ones I had before!

So please fix this bug, and please fix my problem here :(

you probably failed to read the spell

What did it say when you double clicked the scroll?
You may not have been intellegent enough to learn the spell or just failed to learn it which is rather unpleasant due to the prices of them. :(