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Argiope anasuja
when threatened it brings its limbs together to join with the web to appear bigger
The problem with all these Argiope (4 or 5 species found in India), that they all look very similar, all are variable in colors and marking and many of the IDs you will find are not correct or not trustable.
In your case I am pretty sure it is Argiope anasuja.
http://www.indianaturewatch.net/displayi...
http://www.eol.org/pages/1194662/overvie...
https://en.wikipedia.org/wiki/Argiope_an...
https://asinghspeak.wordpress.com/tag/ar...