renault card keys?

My card has just broke it comes up not detected it opens the door but does'nt start car i was stuck with 2 young children had to join the rac to get us home. The man said its more than likely the reader then a fault with the card itself. Does anybody know where i can get a new reader bearing in mind i have to get the redaer back out and turn it over put card on it then start the car. The car is a 53plate megane 1.6 vvt expression. Help. My spare also does this.