If what you say is true, you may have a cause of action in invasion of privacy and nuisance. Nuisance signifies that the "right of quiet enjoyment" is being disrupted to such a degree that a tort is being committed.
In California, installation or use of any device for photographing, observing or overhearing events or sounds in a private place without permission of the people photographed or observed is against the law. A private place is one where a person may reasonably expect to be safe from unauthorized surveillance.
If you need help, contact an attorney locally.