Complain to Town Council
Complain to Police
If activity is really illegal, they will certainly keep the noise down after that.
If not action from above 2, complain to MP.
For sure the above 2 will give some sort of response.
Then again, you need may to do some introspection (are you too irritable) or give some understanding to your neighbor's needs as well.
I know some ppl maybe a bit 'siao' anything also 'noisy'
BTW, I live across the block from the famous Yishun lady (reported on newspaper and MP Lee Bee Hwa ask for suggestions to resolve this) who will shout and scold at about 7.20am on most days

Sound is bearable on my side, but I really pity the next door neighbors as well as the old lady (mentally not sound).