Do you have one of those electric tennis raquet type things (bug bat) from Bombay Bazaar, the large market stall type place just before you come to the top of Calangute High Street from Candolim (for those who do not know where it is)
They cost 120rps and are re-chargeable and you just take a swipe at one of the blighters and they get sizzled on the bat
We have one in every room.
Also for anyone who stays in Goa for any length of time we bought an "Elite" insect catcher like they have in butchers shops in UK for about 2,300rps a couple of years ago and has been worth its weight in dead insects. Bought it from the upmarket lighting shop just off 18th June Rd in Panjim, just off the roundabout near to Domino Pizza shop.