Is the first person obligated to pay the amount paid on their behalf by the second person, and are they bound to pay the agreed-upon 2,0 dirhams despite the car not being repaired as per the agreement?

The just resolution in this matter is for the car owner and the garage owner to appoint an expert. If the expert determines that the worker did not complete his task, he is obligated to finish it; otherwise, he is not entitled to payment. If the expert determines that the work was completed, the hirer must pay the full wage. If they dispute the amount of the wage after the work is done, the garage owner's statement, along with his oath, is accepted if he claims what is plausible; otherwise, the wage of the like (market rate) is applied. Compliance with the judgment of a third party is not obligatory unless both parties appoint him as an arbiter and agree to abide by his ruling.