Please follow following steps;
1- Displace the luggage and clear the area fully. Try not to disturb the termite channels otherwise termite worms can be spread in remaining areas and posing and increase in termite rate.
2- Buy Bio-Flex medicine and Turpentine Oil 3 to 5 Liters
3- Mix medicine and oil in small bottle of professional sprayer, spray the medicine on channels. During that activity keep family members away
4- After an hour, remove channels with help of scrapper, clean all areas and especially pour medicine with help of injection in that area/wall/floor from where channel started growing.
After above, you might need to repeat same after 2 or 3 months to be on safer side.
Further more, if roof supports are of wood (wood baallaa as per my judgement after seeing the picture), please check it thoroughly for termite presence or 1 day whole roof can be collapse resulting in personal injury.