Worse service ever from Discovery and Renew-It (Sandton)

The worst service ever! Why did we change car insurance companies? My son was in a car accident last year November, Discovery send his car to Renew-It, Sandton. Lets not even start how pathetic their service is! Discovery allowed the car to be released, a day later the cars bumper fell off! The airbag light indicated its malfunctioning and the headlights were different colours! But Discovery thought this is nooo problem. Not the end of the misery by a long shot! The car was returned back to Renew-It. They pronised us, by the end of the day it will be fixed. Day 3, and still no joy. No communication from *****-It, or Discovery. When my son tried to follow up from Renew-It, and tried to get some form of fback, from the manager, they dropped the phone in his ear. No help from Discovery side! I lost it eventually and phoned Discovery, arent they suppose to facilutate the process? They noticed our complaints on their system but never, even after my rant, got back to us, or followed it up! They better go and sign the car off before we take it! If the airbag is malfunctioning after release and something happens to my son in an accident as a result of that, there will be hell to pay!