This was supposedly a “practical joke”. Practical jokes are never funny as far as I am concerned.
To make things worse for this poor woman, she was still learning English and British culture. And therefore; in no way, could she have distinguished one British accent from another British accent. As an American, I could not have either.
http://en.wikipedia.org/wiki/Practical_joke
“A practical joke is a mischievous trick or joke played on someone, typically causing the victim to experience embarrassment, indignity, or discomfort.”
And yes, these 2 jerks need to be punished. Jail sounds good.
That's because you are American. Educated Middle class Indians have a better understanding of British culture than Americans.
Besides, she had been living and working in England for 12 years.