Do not take it personally. There are probably a hundred different reasons why they are not responding. However, you have to keep on trying and without naming any, find services (online or print) that can help you locate a residence.
BE POSITIVE AND PERSISTANT.
Yeprem P. Davoodian, M.A.
Rent.com has several listings in the LA area. Plus, you get a $100 reward card when you lease one of their advertised apartments. You must list them as your referral source. Here is the link
Feel free to email or call me with the details of what you are looking for.
Neil Kenes - Keller Williams Realty