Defects not disclosed/travel costs

Hello dear subject purchase Mercedes B class from private to private in Austria. 1 hand with 201Tkm. Yesterday I was visiting a B class Mercedes on night. Asked the nice gentleman on the phone if the car lacked in response no super car,….since 2013 in possession always in the garage….the usual. My approach up to in took almost 2std in one direction 140km. Arrived and made around the car round and had already noticed that the older gentleman about 50years not so honest to m On request if he was accident-free he only meant a wild accident at the front left Xenon headlights and bumper that would be all! Now to the car big dent in the passenger door(no word of it on the phone),Delle passenger fender 5cm, li+re side wall painted with dust inclusions, underbody very rusty. On my fault of the optical things came from him time and again the answer it was a used car which is 10 years old. My Citroen C4 Picasso the 2009 bj with 262Tkm sach is better off from the body without rust approach. I told him he would have told me that with the rust on the phone I wouldn’t have started. He said about rust he didn’t know he only washed the car today and did not notice him. The rust does not come from today to tomorrow. Too bad about the lost time and travel costs. How do you see all this is so OK? Would I have been able to charge the travel costs (Sprit 50€) or unfortunately it was a disappointment at the end of the day.