Anti-theft Controller problems of the 2012 Nissan Sentra

I purchase used car from 2012 I never expect to have any car problem for at least 4 yrs, but that was not my case in 5 month of having the car it started to give me problems. The fist problem is that I had a leaking that was coming from the sun roof and the top light. I was told that the way is made it had to drain tube and they get clog. I was also told not to park my car under tree. Uh that's is kind of hard there's a lot trees in the country. I had to change the battery in about 3 months. The car when I turn it off the motor was still running. Few day after the my car would not start not even manually. I told that the ignition was not working and the anti theft system lock therefore I was not able to turn the car on. I also saw that the metal that is under the stering wheel was rusty from the leak. I research the recalls, but was not able to find any on this year. However I found the previous year had a recall and was the same issues I'm having.