BSNL Network — Broadband not working 20 / 30 days a month

Address:

Ranchi, Jharkhand

My BSNL LL[protected] is in order.Yoyr service personnel have configured the i-Ball modem too...the coonection is not even staying for seconds, automatically disconnecting...this has been going on since 15 June15.
No corrective action has been taken despite repeated telephonic and in-person complaints.
I'm being given flimsy excuses like server is down, its raining now, next 2 days it will correct itself, etc which is just nonsense.
Im an old BSNL customer for past 10 yrs..never faced this problem.I have 950 UL plan which I have made annual payment till May2016.
Im incurring financial losses due to callous attitude of your staff.Please rectify