• the giving and taking of dowry.
   
• demanding dowry.

 ....which are offences under the Dowry Prohibition Act.

Apart from this there are offences related to dowry, like cruelty under Criminal Law (Section 498A, Indian Penal Code), which are:
 

• Cruelty which is so severe that it is likely to drive the woman to commit suicide.
• Cruelty which results in severe injury to the mental or physical health of the woman.

If your husband or any of his relatives are harassing you for dowry then depending on their behaviour they are guilty of any of the above offences.

Apart from you, your parents, or your relatives can also make a complaint of any of the above offences at a police station. There may also be a Dowry Prohibition officer in your city who you can get in touch with. Most of the major police stations in various cities in India also have a dowry prohibition cells or Crime Against Women cells, which can assist you.