need urgent help

Hello I had an Opel astra bj 96 were so with the tüv and defects engine drain oil 2 axle different spring types and fog lamp without function… ok we didn’t want to put any money in for the year of construction have it advertised with tüv expert reports and pictures …etc for 200 plus 50 Euro summer tyres on rims. . Well ebay put in written bastler vehicle no guarantee no warranty. Someone came to have looked at it took it with for 250 with rims … contract a ufsatz bastlerfahrzeug bought as seen with address and signature …now the problem he has gone and 600 m he has stopped ..why ever. ..I am now obliged to give money back and take car back