Suzuki bryanston

Be aware of suzuki dealerships. I Bought a suzuki celerio 2018 demo model from suzuki Bryanston it was advertised with 6000km on the clock and on the payment document it says 6000km on the clock. But when I paid for it and they delivered the car it got 9755km on the clock 1\3 more. Is this false advertising or froude maybe. Suzuki South Africa can't help me.. Can anyone please give me advice on this matter please.