Tata Docomo — failed to registering

Address:

West Singhbhum, Jharkhand

Before one month I purchase the tata docomo sim.starting i had worked good but in that time internet is not working.So i complaint in 121 customer care.they solved my problem.after 10 days again i got a problem in this time when i am going to call any body the sim show "Unable to connect" and other problem is my internet is also not working,it show "connection failed".again I complaint against this issue through chatting and calling.They told me that your problem is resolved with 24hrs but the issue is same.My mobile handset is MicroMax x510,it had purchaesesd before 1month.So plz kindlly do something.