Nuisance from neighbourhood

I reside in Vasanthnagar Bangalore, there is a pg behind my house which caters for around 70 girls. It is adjacent to my southwest bedroom. The noise created is sometimes beyond tolerance, the girls start meeting ,greeting around 11pm and the gathering goes on till around 2pm everyday. The noise is on and off, laughing banging slamming the doors ....... I have raised the issue several times to the lady who owns the place, but resides elsewhere, she is not affectedby these disturbances at night. There is no warden during the night times . Whenever I complain the watch man comes on his roof and asks the girls to stop, but he too has to call the girls loud and the disturbance is even more due to this as he has no access to the pg. The shutter is pulled down and up in the late hours sometimes a number of times, and very early in the mornings the noise is so disturbing that we are not able to sleep. Earlier when the renovation was happening, our complaints were answered very politely by the owner very apologetically, now she says the pg is been registered and the protocol is 11pm for noise and denies the complaints. To make it worse, they have constructed a room ground floor, first floor for the security guard at the compound without any setback on the same southwest bedroom of our house with a sheet roof. The watchman lives with his family, they are too loud and most of the time on the roof which is at a hands stretch from my window. They are talking loud, drying clothes even their children accompany them on the roof which doesnt even have a fence and when they have guests they keep awake the whole night . The watchman wife does the washing of the used utensils by the pg girls late in the night making loud noise and when we ask them to finish all that before 10pm, they justify by saying the girls finish their dinner only then and they have to prepare for their breakfast before 6am. So they can't avoid the noise. Can you please suggest a way for solving this ?