There is a law in Singapore about the use of hammer drills on a Sunday but the only people who can enforce it are the police.
It should have been reported to them as soon as it started, they are then required to follow up a reported illegal action.
By waiting until 17.30 you have effectively condoned all that went before, haven't you?
I managed to get it stopped around 07.30 one Sunday morning, the contractor knew that if he started again he would have trouble with the police, not me.
Sorry PNY but I think you went about it the wrong way, Thermal Image has it in a nutshell.