What is the issue? It is not bad to have contact with anyone including police. It is only unfair to misuse this. If the hubby is misusing his influence against his wife, she may contact higher administrative and police officers and NGO for solving her problem.
If this person is abusing someone with the help of police, then the best option is to approach your local Corporator and take his help. Otherwise, there are many women's rights activist groups that you can take help from. These groups not only are able to bring police to take correct action, but they also have their own lawyers to help you guide through the right procedures involved.
There are cases when the local police coming under the influence of the offender refuse to register a case and in these circumstances the best course is to knock the doors of S.P or D.M.Now courts too intervene and direct the police administration to book the offender.
I can understand the situation adn how the system works in India. I found this site where it has helpline numbers of NGOs mainly working for distressed women, this document has numbers of Mumbai cells, hope it will help you:
http://www.sheriffofmumbai.com/1298.doc
It's important to shed the negative mindset.I agree there are so many things not working in our favor but we have to make most of the avenues available!
It's not necessary to have influence to get the desired results all th time and I believe there are honest and conscientious officers who do respond helpfully!