There are no hidden charges. Read your pbo and an administrative charge (5% i think) will be charged. I dont think you even read the terms on pbo? Khair belows is thw clause
The remaining amount of the Price shall be paid to the Company prior to the delivery date of the Vehicle. In case the Applicant fails to make payment of
the remaining amount of the Price, the Company reserves the right to cancel the order and shall refund the amount paid by the Applicant, less an administrative charge equivalent to 5% of the Price