Regent insurance & Eldan Auto

We've had a claim from middle of November where the Service provider (Eldan Auto) did not repair the vehicle correctly which resulted in the car overheating. This then damaged a cylinder in the engine. Eldan Auto was responsible for the damage and organised a vehicle while ours had to now be fixed at Kia Menlyn because of Eldan's negligence. We received a call from a person who says they're the owner of Eldan complaining that we have taken the wheel caps off the car. She ended up telling us f*ck you & we must f*ck off with our piece of sh*t car. We spoke to the insurer about this & even emailed them thereafter but nothing has been said or done. On the other hand we requested a damage report with information on our warranty/guarantee on workmanship, but also none of these were communicated to us. I am not sure who to speak to anymore & would appreciate any assistance here.