will not start - error message "key/card not recognised"?

We have a Megane 1.4, 03 plate which will not start but gives the errorr message "Card not recognised" We have heard that www.keyrepair.co.uk, based in Pembroke, will probably be able to fix the key/card quickly at a coat of £25 -30
does anyone else have any experience or knowledge of this organisation please?