@author
Police favor money and they favor girls. So if a girl/her family pays, then you should understand who is their favorite.
Complaining to senior officers - will only make the police more against you. For you there is no real benefit.
By not taking neighbor's statements' also, no real damage is done to your case.
YOU can arrange for those witnesses in the court, your advocate should help you.
Let police do whatever they want first, then is your turn. So if the case is already registered, just relax nothing to worry
immediately (if you could prevent it then it makes sense to worry).
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Rather than trying to complain against the police, try to collect strong evidences against the 498a lady.
That will help you more
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