new member owner red viper 2000 germany

[viper2000]

Hey guys! We are owners of a red viper in Germany. Unfortunatelly not happy with the car.
The car dealer here in Germany sold it as "no accident" to us. When the car arrived, there was a big crack in the airbag plastic cover on passenger side.
He said, don't worry, there is nothing wrong with the airbag, it's just a crack in the plastic from the sun! The car has a lot of other cracks, inside and outside.
When he showed us pictures before the purchase, there were no such cracks. He only said, that it is in good condition according to age and great low price because it is sold by an insolvency administrator from Italy, who needs the money fast.
And the little cracks there he will fix within 10 days (incl. in price) and bring the car to our house.
After asking and waiting and asking and waiting for 8 months!!! the cracks are still not repaired. Car is still at car dealers place. Getting worse and worse condition (he parked it outside). He always says, he is ill, he is ill, he will do it, then he is ill again, then promissing repair again, then again ill.

We tried to sell the viper then via internet. One guy interested in buying it, asked us for the VIN number. He checked it and told us, that there is a "Salvage" and a "Rebuilt" title in California!!!
But the cardealer says, no, Carfax is wrong, there were no accident.
We purchased also NMVTIS - also showing salvage and rebuilt title.

We gave the case to lawyer. How can we prove in court, that this is an accident car?? How can we get more information about the titles or the accident in California? (we tried to call Vehicle Department in California - but they only give information to people with us driver licence)
thanks a lot in advance