I have a Tata Docomo mobile number and I am thoroughly disappointed with their services.
I had switched off my cell phone for one day and when I switched it on the next day, the whole talk time balance vanished on account of data usage charges.
Hell, who was using the phone when it was switched off? This had happened earlier also, but I had ignored it at that instance.
Now I am switching to another mobile operator and never to Tata Docomo again.