Major Service - more like Major F... Up

If less than 1 was possible, I'd give them a -7. Took car in for major service, came back with gearbox problems. The head mechanics, and I quote, 'Eish', the other 4 mechanics standing around just did NOT know what to do. Try talking to the manager, yeah sure, he understands didly squat. Speak to Head Office, no we need time to investigate, leave your car here, you just f'ed up, why would I leave my car with you.