Your Istimara should reflect the most recent details and so you need to go to the traffic police department and change your insurance company.
If you do not update your Istimara with new insurance details then in case of any accidents, you will be paying for repairs as the record will show only 3rd party insurance.
Once you have updated the Istimara with your comprehensive insurance, the previous 3rd party insurance would be irrelevant as any future insurance claim would be made on the new insurance documented in the traffic police department.
Your Istimara should reflect the most recent details and so you need to go to the traffic police department and change your insurance company.
If you do not update your Istimara with new insurance details then in case of any accidents, you will be paying for repairs as the record will show only 3rd party insurance.
Once you have updated the Istimara with your comprehensive insurance, the previous 3rd party insurance would be irrelevant as any future insurance claim would be made on the new insurance documented in the traffic police department.