that sucks…
Hit whilst on your bike? or were you in a car?
did you provide insurance details? (if you were in your car and the rest of this post is based on tha assumption)
If so you insurance company fixed your car I assume… and based on those 2 facts send the letter to your insurance company and let them deal with it.
If you didn’t admit liability to him and said no to paying his excess then reported it to your insurance company then they haven’t got a leg to stand on.
If you didn’t report the incident then I’m really not sure.
Oh and if you were on you bike then I also don’t know.