Used car: seller has made incorrect information about timing belt changes

Hello! I bought a used car from a dealer today – probably a little hasty. I need to rely on the car. PLEASE PLEASE save you comments like “how can you be so stupid” or something like that, I need concrete help now, because I will go to the dealer tomorrow morning. Before the purchase I addressed the seller several times on the timing belt change and he said: “You can ride there for more than two years until the change has to be made!” Unfortunately I was probably too After my research, however, the timing belt change is necessary in about 2,000 km. So the statement on my repeated requests was definitely wrong. What is your advice in this situation? Should I ask the dealer to return 500 euros for the timing belt change or should I immediately withdraw from the purchase, also because of the loss of confidence? I know, actually not so easy, but under the condition that I give the seller more Is this the change of timing belt and he made a false statement, should I have a good chance, right? Look forward to your thoughts and help. Jean