If that is the case you have grounds for returning the car to the dealer that sold it to you if you should so choose to. When you buy a car from the dealer it is their responsibility to ensure mileage is correct and things like this arent passed along to unsuspecting buyers. It can constitute odometer fraud here in the states simply because 49K km is not the same as 49K miles. If it displays km but actually reads miles it is false and therefore the car was bought with misleading information. I would go back to the dealer you bought it from and run the details by a manager and see what they are willing to do to rectify the problem.