i was leaving my job, i park on the left side of the building i work at , i backed up and continued around the front of the building going mabey 10

Mph and nobody was backing out at the time I was driving behind there cars but then all of a sudden I see break lights and the car proceeds to back up hitting my passenger back door causing my car to proceed to hit a parked car and also during that time my brakes locked up so I couldn't stop my car at that time I hit the parked car. I talked to the insurance people and there trying to say it was both our fault? How is that? I was looking where I was going and it's like she didn't turn her head as she backed up because I was already passing the vehicale? I called the police and no report was taken just gave US a crash report to fill out. And exchange! No one was hurt! The person of the parked car said her escalade was fine she wasn't pursing any damage claims. Also at that time I talked to insurance I didn't know there was any witness. But just found out a pastor that was at the building asked me today was everything ok. I asked him what did he mean, he said about the little accident?