Hi 2 all my fellow punto owners ,

I bought my Fiat Punto hlx jtd 1.9 Y reg . I only recieved a blue key + fob remote when purchased privately but the key fob now isn't working and the blue key doesn't open any of the doors . I have changed the battery on the fob but still not working and the car is locked with no way of getting in . If any of you have came across this problem PLEASE HELP .