Citibank — Recovery agent disclosed my personal information with 3rd party

Address:

New Delhi, Delhi

one day a oerson from citibank visited my previous address and disclosed my petsonal information with 3rd party and said that i owe a bill, i called them and asked them to cease all the visits and they said ok we will cease all the visits and today again someone visited the place and inquired about me which is a breach of law, do i just wanna know what should i do. shall i go ahead and sue them.