Misinformed and very unhappy client

My mother recently bought a car and I requested for her to be called back for insurance for her car. She then got a call back from outsurance and she accepted their offer on the same day. She was then told that her car would be covered from that moment on and she was very relieved to know that her car was covered at that point in time. Unfortunately, my brother was hijacked last night while driving the car and when she called outsurance for assistance, she was then told that her car was not covered since the first payment hadn't gone off yet. She was misinformed and now she is devastated, what kind of assistance can we get regarding this matter?