What should i do i really want out my lease?

I moved into a 2 bedroom in reno and we have a newborn and 2 little girls,we contacted the office about roaches in our home and they did nothing and when we went back they said they never heard of no such thing,its been over 3 months and nothing also we had a man expose himself to a 14 year old girl in the washroom and the never kept the ppl posted on what happened.not only did this happen they had a hit and run with two cars right out side my bedroom window and no police came not even there gaurd that they say is walking around....I not only fear for my little girls but for the other kids around here and the roaches is just not clean or health ,if you think thats bad i went on my patio and someone had put a used condom right there where any kids can grab it......All i want is out my lease and i dont know how to do that cause everytime we go there they say write a letter or we should take it up with there lawyers what should i do