VW Lindsaysaker Fourways Gross Negligence

I took my car for a service to VW Lindsaysaker months back. 2 weeks ago I took my car to get the brake pads changed as the mechanic starts to work on the tyres he tells me my left front tyre has been loose for months I should be grateful to still be alive mind you I was even pregnant at the time. I called VW to inform them of this and I was told the service manager will call me back. Till today I received no call from the said manager.