so, are they really part time whores

3 reasons:

Facts
1) The call-girl adv. on the laptop at the office( before falak gets laid off)
*or was it photoshopped by the gang to wreak revenge ?
not explained , so debatable

2) confession that they took the money.
*later on she says otherwise to Deepak Sehgal
to the viewer its still not clear to whom is she telling the real truth. This remains debatable.

3) Final credit scene clearly shows all girls going to the rooms with their 'partners' and leaving Minal with hers.