Unfortunately, I got a postpaid line of Vodafone. I have never ever seen such a bull shit service from any mobile operator. Believe me, till now I am not able to make one minute of international call :( But I have to use this line for at least 3 months and I can't close the line before 3 months.
I am tired of calling Customer Care each time. Now just waiting for time to close the line. No use of calling Customer Care, you will not get any help from them.