Mumbai Traffic Police — Challan no MUMCM[protected]

Respected Authority,
we were driving from Rajkot to pune and on that road on airoli bridge during left turn police said we jump signal.
unable to understand first why signal as there is a divider for left turn and again it is left turn.
second point is why it is considered as dangerous driving. if he has any film would like to check as i was dring with my wife and son and will never do so.
my humble request is that please clear this. Thanks for your kind support.
Thanking you,
with kind request,
Jignasu Mehta