VW Greenstone Windscreen Repair costs

My wife's vehicle went to VW Greenstone for a service (13 August 2019) and was contacted by a lady with regards to a stone chip on the vehicle's windscreen. My wife was told that their would be no charge to her but would need to phone our short term insurance company and speak to a specific person to get the authorization. My wife did this and received an sms with a reference number and the stone chip was repaired.

Not more than 3 weeks later my wife's car was back at VW because of an issue that could not be resolved during the service and the same lady contacted my wife to say that there were more stone chips on the vehicle's windscreen. This is when my wife realized that something was not right as the car had no additional chips in the windscreen.

Just to add salt to the wound, I received my annual claims history from my short term insurer and noticed that this lady (not sure which company she works for) through VW Greenstone had claimed an amount of R 3,737.50 for the stone chip.

I don't want to point fingers but surely a stone chip repair with labour cannot cost more than R 1000.00 to repair. I feel that an investigation needs to take place into what claims these people are putting through on customer's insurance policy's.