Whatsapp — Someone hack my what's app number and making false group with unknown person

Address:

Plot no 62, Vikas nagar vistar, murlipura scheme, Jaipur-Rajasthan

Last couple of weeks I got message on my what's app and so many new number appeared on that group, unfortunately I was as group admin. I exit myself that time from group. Recently I received voice call on what's app and that call was again for complain against my number. Please take necessary action against this complain because someone giving hard time to some good people and defame my name.