Alliance — Net is not working in my area for 6-8 hours

I live in burdwan.i have a alliance internet connection here.But, for 6-8 hours net connection is not coming my area.my router is absolutely fine.why is this I don't know.please fix it as soon as possible.It is very much needed for my work.this problem happened before also but only for 10-15 mins.but today on 29th April it's not working, nei connection is not working properly.the problem was from yesterday till today at 3:30 am.still net connection is not working properly.please fix it.