The city, she said, had not responded to their complaints.
The larger companies have systems in place to respond to complaints and problems.
Over a six-month period in 2004, state health workers went to the home 39 times to respond to complaints.
They also refused to respond to complaints of religious discrimination.
Immigration officials said they had worked hard to fix problems and to respond to complaints.
"We will only respond to complaints; we're not walking the streets like a secret police force."
The company had responded to complaints, but not always to customers' satisfaction, he said.
The police and prosecutors have so far refused to respond to the school district's complaints.
The city says that by using the private companies, it is responding more quickly to complaints and accidents.
Administrators should have responded to the musicians' complaints long ago.