I think it is a common occurence in France to abreviate callsigns. Wether this is their SOP, or just something they do, I do not know. It is not per definition wrong to do so.
If there is an EZY 2PM and a EZY 5AC on the frequency, I can see no reason why the French controller can't speed things up by saying EZY PM, EZY AC. As long as the controller knows exactly who is in his sector and which callsigns might create confusion.
Mike, you say you might be ok with this on a very quit night, I say it is more down to the controller, after all, he has a bigger picture. On the other hand I can understand that you do not trust the controller to be in control...
However, in your situation I bet you $100 that the controller just made a mistake because there is no way you can realistically abbreviate NJE (fraction) 2PN into November 2PN.