Mahanagar Telephone Nigam [MTNL] — mtnl phone not working.

I kishore chhabria having mtnl no 26239406 and my ca no is [protected]. My phone is dead since 26th of march 2018. After nearly every alternate complaints my phone did not start. I visited mtnl lallubhai park office on 3rd may 2018. Mr. Pawar was present and he said that mr patel and other linesmen were on leave and showed inability to start my phone. I gave a letter for complain for rebate for the month of april as full month the phone was dead. Now i have received telephone bill for april!!. When i had given the letter for rebate then why did i receive the bill to pay??. What should i do please guide me. How does mtnl work like this. Today is 17th of may and still the phone has not started. Please guide me as to what i should do. Thanks
Kishore chhabria.