Every cambio car has their own reserved parking spot, which is usually provided with a parking barrier which blocks off the space while you are away.
Did you forget to put up the barrier and now someone else took your parking spot?
Park the car in the neighborhood and call the reservation centre. Make sure you find a legal parking space and confirm that there is no parking ban within 48h.
The reservation centre will inform the next user of the car.
“But to prevent is better than to cure”. So make sure to always pull up the parking barrier when leaving the cambio station!"