assuming you are insured, use your insurance company to get what you want. if they call, just tell them you're going through your insurer.
some years ago a woman ran into me while i was stationary (i.e. her fault). she was driving a government car on a weekend, dressed in horse-riding gear. clearly not for gov't use. about a week later, i received a letter from a melbourne insurance company listing damage all over her car (even though prang was front left quarter only) and asking me to admit being at fault.
i threw the letter in the bin and didn't reply. i took the car to a registered repair shop and they sent the bill to my insurance co (nrma back then).
don't deal with them any more, use your insurance company. if you reply to any of their letters or phone calls, they might be able to use this as your admission of fault. if they call, be polite, but don't talk with them: "my insurer is dealing with this matter. goodbye".