I got same problem last year. I went first to the police and got two reports.

Then I went to the insurance company (QIC), they gave me kind of document and they point me to which garage to go.

In the garage they striped off the paint from my whole bumper, which were scratched and repained it.

I've payed nothing.

If some parts must be replaced, depending on the insurance company, you are to pay 30-40% of the price of the part/s.