Next Time, be more aware of the person you are making a purchase from and make sure everything works.
Hopefully this will teach you not to buy something without thoroughly testing it out.
The person that sold this to you should be ashamed and don't be so hard on your self.
The way I see it you were taking advantage of.
Don't feel guilty,You are the Victim. Use this experience to learn from it ...Sadly,Not all people are Truthful.