Hi, Since I am facing problem with my Mblaze internet connection at night and I have some important task to take care of urgently on internet, I think I need to talk to customer but is it OK to call them at this time ie. late night , do they work 24 hours or only at day time ?

Yes, you can but most of the time they will ask you to call in day to get full information. I have called in night 2 am when my mobile internet stopped working though everything was fine.