I activated Tesla's Smart Summon feature on the 2017 Tesla Model S to autonomously drive from the parking spot to the front entrance of the restaurant where I was waiting. Pulling out of the spot (my car was back in), the vehicle prematurely turned and contacted the front bumper of the adjacent vehicle (also backed in). My vehicle proceeded for a few feet causing severe damage to my driver side and the other vehicles bumper. I entered my vehicle and pulled away from other vehicle which is still in contact with. Take document with photos, I returned my vehicle to the location where it occurred (except not in contact). See photos. I contact that evening and they spent the next week investigating. They disavow and responsibility and said I was supposed to monitor the progress. The incident took a few second and there was not time to react to avoid damage.