Since customer service is not assumed in France, it's important to give credit where it's due. My hat is off today to the folks at the RATP, the authority which runs public transport in Ile de France.
Believe it or not, my husband and I both managed to lose our Navigo cards, our unlimited passes to mass transit, within a few days of each other. Pulling my card out of my bag as we arrived back in Paris from London on Friday evening, I was thinking that I needed to get a replacement for the cracked plastic case. Tomorrow, I said to myself. By the time we got to the metro entrance, not five minutes later, my card had slipped out of the case, lost underfoot in the crush of humanity at Gare du Nord.
But no matter. The lady at the Montparnasse branch of Le Club RATP (open on Saturdays and Sundays!) was all smiles and within minutes, both of us had a fresh Navigo pass in hand, no questions asked. Well played RATP. I'm a fan for life.