Never before and then twice in the last few weeks. Is it my age (I'm nearly 40, but the shop assistants looked to be a similar age to me) or just something people say now? I don't know if 'Madame' would have been worse or better.
I don't think I like it and I'm not sure why. I wanted to say 'I'm not the queen' but that would have been rude so obviously I didn't.