I don't know if it is a straightforward "fishing" expedition to harvest your bank account details and empty your account or another type of scam but, unless someone could prove to me that it wasn't it will definitely come under that heading. Thanks for the heads up.
An Aunt of mine got scammed by a call like this when she was called by someone trying to flog her a device that plugged into her electricity and was "guaranteed" to cut her bills. She is normally very savvy but was very low and vulnerable at the time because she had just been widowed a few weks before. She ended up agreeing to get the very pushy saleswoman off the phone and ended up about £100 out of pocket. We are still trying to get it back (but on the plus side she did get a useless box of cheap electronics through the post )
I would point out though, that a) there is more to India than Curry (and most of what we eat in GB is Bangladeshi anyway) and b) most people who work in Indian Call Centres are highly educated and speak different languages well. Sadly, call centre work is considered a good job by many graduates in India.
And scammers come in all types - my Auntie's conwoman was working for an American company apparently currently working out of Cardiff