Return or price reduction?

Hello everyone, I need your opinion: I bought a 99 Escort Kombi 1.8l 90PS diesel with a specified 123000 km a few weeks ago. Now it turns out that the box has 100000 km more on it, which I can also prove (was not recognizable from the condition, and I really paid attention to many details). The seller himself had not driven the car (probably again such a “private” car dealer, but I can’t prove it). 1. The possibility is to return the car, including the costs of incurred expenses minus the use (0,7-1% rule). 2. Possibility: corresponding reduction of the purchase price and now my question to you – what do you think of an escort with now 230000km? Technically, the thing makes me a very reasonable impression. (Puff new, brakes quite new, shock absorbers at the back also not a It should be changed then in any case still the timing belt, which then would have to be the task of the seller. How high would you think the price reduction then be? Oh yes, the purchase price was 1700,-€ and windshield was renewed by me. First of all thank you… —– no more car purchase without service booklet or similar know-how —–