A significant proportion of Nigerian families that live in the city have househelps some of whom are not paid. These people essentially live their whole lives on the instructions of oga and madam. They are sometimes unable to leave the house, education may be withddrawn from them etc etc. I know some people treat their help well but do you think the general Nigerian culture of having live in help in the house is a form of enslavement of less fortunate Nigerians? The video below (it's slightly lengthly) illustrates my point:
http://www.youtube.com/watch?v=PpRi4tJ7hE8

So long as you don't own your own work, you're a slave. Not the definition that most are familiar with, but it is the definition. So house help, fits the definition.

a housegirl is PAID so no that would be a servant not a slave.

now if you force her to work without compensation against her will then it would be a slave

The househelps are paid and most times have a contract detailing the terms of service.

All these are worked out prior to their being hired.

However, many of them come from underpriviledged backgrounds and this is a very important factor because they tend to receive no help or counselling to cope with this.