Buying a second-hand car comes with many problems and this is one of them. However, it appears from your email you do not have much experience in cars. The difference from a car that has done 80,000 Kms and one that has done just 21,000 Kms can be easily judged by an experienced person. The car itself gives telltale signs of the kilometer it has done. As for this incident, I suggest you charge it to experience.
Buying a second-hand car comes with many problems and this is one of them. However, it appears from your email you do not have much experience in cars. The difference from a car that has done 80,000 Kms and one that has done just 21,000 Kms can be easily judged by an experienced person. The car itself gives telltale signs of the kilometer it has done. As for this incident, I suggest you charge it to experience.