The word post is increasingly being used in India as a synonym for after. The problem is that it is being used as a preposition rather than as a prefix. Take a look at the following examples taken from Indian publications: -
1. Kunal Dasgupta, quoted in The Times of India (TOI): Zee TV had staged the Indian Cricket League which was a failure. Modi was attempting an IPL post that.
2. From an article in the TOI: Women who live in Faridabad but travel to Delhi for work say they would never venture out alone post 8 pm.
3. From India Today magazine: This month Jake Gyllenhaal proves the fact that nothing works better post a break up than an extremely sexy makeover.
In all the examples given above, after should have been used instead of post.
Post should be used as a prefix, as in post-match press conference, post-partum depression, post-natal complications, postdated cheque etc.