Bharat Sanchar Nigam [BSNL] — landline dead from last three months

Sir
I have an landline connection which is inactive from last three and half months.
For this i do complaint to bsnl office but they didn't give positive responce to my complaint having issue and told that we will check it. But they didn't send any technician to check the connection and the connection is still inactive. The company generate new bill every month without usage. And phone was dead frm last three and half months.
So pls help me to solve this problems