have to say I think its unforgiveable behaviour! I've been a nanny for over 20 years and only ever shouted at a child once, when he was running across a courtyard and I knew there was a 6 ft drop the other side.
I currently look after 11 month old twins who are just crawling (generally at very high speed in opposite directions
). They're busy and need my constant attention but that's what I do: its my job and I would never shout at them. I never make or take calls when I'm working and have my phone on silent at all times. The only time I don't is if one (or both are sick) and they're parents may check in.
It makes me really cross when people who aren't up to the job give those of us that work really hard and enjoy it a bad name.
From my experienece though people tend to notice twins so I'm sure you'll be able to track them down. I know the people I work for often bump into people at the weeknds who stop to speak to "my" twins as they recognise them from being with me all week.