Citroen c3 desire key fob not working?

When the key fob is pressed to lock or un-lock my car there is no responce as if the battery needs changing. Changed the battery but no luck. Problem is I can't lock the doors manually as it only locks drivers door only. The central locking button in the car works fine but of course I can lock all doors from the inside but when I open drivers door from the inside all doors unlock.