You can do so within the first 30 days to get a refund of ₹ 499. Subsequently, you do not get any refund.
No. it does not carry any interest provided you repay the advance within 28 days. There is no option for extension. You have to repay within 28 days.
The Travel Safe Membership is provided by CPP Assistance Services Private Limited.
The Road trip travel insurance is a variant 2 CPP Travel Safe membership.