Earlier quoted context omitted.
"do the needful", "please revert back to me"-- phrases like these are not 'invented' by some Indian speakers. These are the stuff Indian savants picked up from the old English books. Then, these savants taught this stuff to fellow Indians and this dynamic gets reproduced everyday. See an entry from Charles Scholl, Geroge Mcaulaly et al's "A Phraseological Dictionary of Commercial Correspondence in the English, German…
It's interesting to see where it came from, but why does it persist? Is consuming English language media and the largest internet sites uncommon for English speaking people in India? I imagine I'd notice pretty quickly that English speakers in TV, movies, and on youtube, don't speak the way they did in the 1800s.
Over time, isolated from the cultural changes happening to the English world, it developed in it's own way. Like the albino and blind animals evolved in the seclusion of an isolated cave system.
Today, the best way to observe this secluded language branch is to read official Indian government announcements.
It has started to meld back into the main branch [0][1] as younger and younger, more exposed to the global English culture, take over responsibilities.
[0] https://pib.gov.in/PressReleseDetailm.aspx?PRID=1888208
[1] https://indianrailways.gov.in/railwayboard/uploads/directora...