The specific figures such as kilometers are clearly marked on the sales contract, and if the actual figures before the meter adjustment are inconsistent with the data promised in the contract, you can request to return the car. If negotiation fails, you can sue the seller to return the car and compensate for the losses caused. In addition, if it can be proved that there is fraud in the sales process, which leads to the purchase of the meter-adjusting car, you can submit a complaint to the people's court with evidence and prosecute according to the number of defendants. If mediation is appropriate, mediation will be conducted first, unless the parties refuse mediation, they can ask the merchants to refund one and compensate three.