accident due to automatic full braking?

hey people I need your help… and I had a crash yesterday and that came so I was on a road with my twingo with a speed limit of 70 km\h so I drove good at 70 and enough distance behind a Q7 suddenly the audio slowed down very strongly so I got a good piece closer to him and in the next moment he makes a full brake, I of course also full in the irons but finally I am on the wet road the Audi driver gets out and is totally confused because his car has made the braking action completely independent???? then we called the police and he has explained it exactly as he stretches it. Then it was first that his assurance must pay and then probably have to settle with audio. and today an early call from the police came that apparently I should be responsible now why always???? I can’t know that the one on the free road the ank he throws and that such an armor is much faster than my twingo is clear…. now to my question, can I really be blamed for the accident? or do I possibly even have a chance to get my harm replaced??? while great if someone could give me an answer mfg Secrex