CDR Phone Records (Airtel)

I seek guidance on the procedure for obtaining CDR phone records (Airtel) of my wife’s number for a period of six months. Following her death, I was arrested and later released on bail after 42 days, with bail conditions subsequently relaxed. The Sub-Collector enquiry has concluded, and the charge sheet has been pending for over 173 days. I request advice on the proper legal process for accessing the required records.