Hitachi Home & Life Solutions (India) — Worst AC Service team

Address:

Chennai, Tamil Nadu

I had registered a complaint([protected]) 5 days ago that my AC is not starting and no one from service center called me to give a timing to visit my AC ..And even I have 1 yr AMC plan.
After numerous calls to call center didnt yeild any results.. I had called service center directly and even then I am being told a service engineer will come today.. But they are not saying any timeline on when they would come. Should I simply wait for the service engineer for the whole day without doing any other work ?