Is this discrimination?

I am a single parent with 3 children (all girls). I am currently renting a house but due to financial issues we have to move. I applied for a two bedroom apartment and was told by the employee that works over the apartment that I wasn't eligible because I have 3 children and I need a three bedroom apartment. I informed her that the twins would have a bedroom together and my oldest daughter would take the other bedroom and I would sleep on the sofa bed I have. She then told me she would have to check with supervisor. The supervisor is always unavailable and now when I call the person tells me this employee is unavailable and I repeatedly left messages on her voice mail, but no one returns my calls. There aren't any other vacancy in this small town and I do not want to relocate elsewhere in Georgia, what can I do?