I will try and do a set of questions in french for you to ask, although this may be difficult for you given the pronunciations. plus on a long distance call with a time delay etc.
Of course you could also ask if there is anyone there who speaks good English, although the Parisians usually take offence to this although I did do that in LV an Dior in Paris
je ne comprend pas- I do not understand
je suis american, parlez vous Anglaise? -I am american, do you speak english?
sounds kinda lame but if it gets the message across at the end of the day they should want to do business with you, if that fails try the Mount st store in London they are very helpful and accept credit card.