Bank Recovery agent harrasing by calling me for time barred debt

My name is Naga malleswara reddy, I had taken personal in ICICI bank Chennai on 2006, due to layoff in my company at that time I did not pay EMI’s for 6 months later on 2017 few members Approached me and told they are from ICICI bank and ask me to settle the loan and I had settled itFrom past few days recently, I am getting calls from ICICI bank and ask to pay loan and contacting my parents, office colleagues and discussing about my loan and informing that I am fraud person. When I told I had settled it they are asking to show settlement documents but it has settled 13 years before so I had shifted many houses so I don’t have that settlement letter with me nowThey are threatening me that they will inform this to my current company CEOI told them not call to my mobile instead i gave given my email id for any queries to respond but they are keep on calling my mobile and disturbing me