Usha International — about service

I have buy a room cooler on 18-06-19. Some problem in products. So i have complain in usha service centre. My complain number is cc[protected].in call centre he said that you will have a technician in between 24 to 48 hours. But it did not happen. Today even after 7 days no one has come. Calling in call center is also not responding. What do i do now?? Please do my problem as soon as possible.