By mistake I've bought 4 extra tickets (return ones)from/to Paris-versailles (RER).
My friend bought it for us but I just got to know when I had it already.
There's any chance I can return those 4(return tickets. All bought last weekend.
Merci/ Thank you,
Unfortunately the RATP doesn't refund RER tickets after purchase. They can only exchange them if they are faulty, but nothing more. I've tried to refund unused tickets myself and have been told that's not possible.