If the case is as mentioned in the question, there is no harm in this sale because it is considered a type of
Salam sale (sale with advance payment) which is permissible. The debtor must deliver the car within the time and under the specifications mentioned in the contract. If you have any dispute, you should refer to the court to have it settled. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.