I am using tata docomo last 5 years .and never I have any problem abaut this service. Tatdocomo provide best offer in festival seasons and any normal days.
Tata domomo is best operator comparison to other operators .Its really good. When ever you want to talk to customer care you simply call customer care and talk them .no time class for talking to customer care and its data pack rate is better than to any other company.
I always advised the my friend to used tata docomo for the service really its amazing and its service is awesome.