Damaged our aircon unit and refused to fix the damage at their cost

AC Direct damaged our aircon unit during an annual service and refused to fix the damage at their cost. Even after one of their technicians said it was their mistake that caused the damage. They damaged the unit on 23 November and after 4 weeks of chasing them for a resolution they responded that we need to claim from our own insurance to get it fixed as they were not willing to pay. Terrible service, non-responsive and they refused to take accountability for their mistake. We will never use them again.