Harassment by icici recovery agents

I had couple of credit cards and a personal loan from ICICI Bank. I had stopped using the same in the year 2003 and requested the bank to rectify some anomalies in the statement but there was no response as such and instead number of recovery agents started harassing me. Thereafter, I had changed my residence and due to financial circumstances was not able to pay the dues. For the 10 to 12 years there was no calls from the bank and also It took me considerable time to get my finances in a comfortable position and in 2013 I contemplated paying back the Credit Card Dues and the loan. So I got in touch with Credit Sudhar to help me do that by taking out the CIBIL Report. Since then, the harassment calls from the ICICI recovery agents have started. I have been receiving numerous calls which are most of the times abusive and not cordial and extends to personal insinuations. On the contrary, I have been polite enough and tried to explain that the intention is to pay back but as and when my finances allow me. Situation at my end has not been that good enough because my salary was unpaid and this happened with two consecutive employers. I would like to pay but not this way. Please advise as to how go about it and tackle this problem.