Oh dear, what a shame. From what you say there is nothing wrong with your aircraft, the problem I am sorry to say is you. You need to learn how to fly it and some of the basic principles of aeronautics. Very simply a flat spin is caused by lack of lift. In a fixed wing aircraft that is caused by insufficient forward motion - not enough wind under your wings.
Read a bit more about the aircraft and how to fly it. It is not one that anybody can get in, press a button and wander off into the blue yonder.
Take some time to learn a bit more - the rewards are worth it.