Is yours a mk1 clio?
On mine you have to release the popper fastenings on the door, I think there are 6 in total, then theres sh*tloads of sealant between the metal of the door and the card itself. Youve got to be quite forceful to get the card away from the door (it does feel like your about to snap it sometimes!) and then lift it up so that it comes out at the top.
It tells you how to do it in the Haynes manual (they always make it look easier than it is!!!!!), its just a case of going for.
I used a proper forked tool to get the poppers off but a big flat headed screw driver should do the same job.
cheers
Rick