I'd be pretty shocked if my bill was that high, too. I'm sorry this was an unwanted surprise when you normally get a heads up of the incoming overages. It sounds like you have spent a decent amount of time working with Customer Care and Tech support.
- As far as the rates go, I've been with T-Mobile for over 5 years and don't remember when they had international calling for $0.20 without a plan. Currently, it is $1.99 per minute for calls made to India without a plan. If you have our Stateside International plan, the calls would have been included.
- In regard to not receiving the text notification, I'm assuming Tech support checked to see if you have message blocking set-up which may have prevented receiving the overage warning. Do you have any third party apps that you use for SMS? Lastly, our system is set-up to show us if SMS' were successfully sent/received so I'm not sure what happened.