Disappointing services

My car had an accident in January , where it was bumped by a taxi at the back. Outsurance refer the car to Great south Autobody to fix the car. Few day after the car was repaired, i notice the funny sound from the back. I took it back they say is nothing. The sound get worse as i drive around. Until my husband check under the car only to find out that exhaust was damaged. It was lockdown but i send an email asking them what do. They say i must go to the panelbeter where the manager or owner confirm that the damege was caused by the impact of the accident that they didn't pick it up at the time because it was small at the time. They say they will talk to the insurance and they will fix the car. It is not 3 months i receive the car. From there they started send me from pillar to post. They end up saying they can't help me. I don't understand why, or maybe they think i broke the exhaust. I end up fixing the car myself as i was tried, because all they do is tell me this will contact me but yet. No one call me. After that they will lie and say someone try to contact me. Outsurance is a disappointment i trusted it i never thought i will experience such nonsense from them. I always say they are professional but they are not. I pay premium every month for half job. They fix my car only half. I am so disappointed. I am thinking of looking for another insurance.