False advertising

We bought a Hyundai I10 2023 model, when getting the car details before the sale it stated that the car has 16 000km on. After signing the paperwork, we got to view the car (not paying attention to the mileage). Once we drove the car from the dealership I checked the mileage and it was 44 000km, which is nearly 30 000km more that it was “advertised” to us for. Two weeks after the purchase, the manager still says he needs to investigate the error (which we notified them as soon as we reached home after collecting the vehicle). Saying it’s human error, no solution to the problem. A whole nonchalant attitude towards their mistake. Quick to get the deal, delayed with a solution to their mistake.