Share 'should smart be liable after reverse gear issue?'

Can anyone help?? my smart is just over a year old, at it's service I reported that it sometimes wouldn't go into reverse unless I turned the ignition off and on again. They looked, 'made a small adjustment' and said if it continued I would have to let them have it for a few days. Well, it still did it, I was out with a seriously ill person, taking them out for an hour for a drive following their…