I purchased a four wheeler heavy transport vehicle with a company financing for it. I paid some instalments on time and there after surrendered the vehicle due to the non payment of the balance instalments.The company sold the vehicle without informing us and after several days sent a notice that we have to pay nine lakh rupees. we didn't respond to that notice but again after some days we got a copy which is a decree awarded by an Arbitrator on behalf of the company to pay the amount with interest.The company neither called us for negotiation or neither we both had discussed about the amount which we had to pay to the company at any previous stage.Now,what is the procedure to be followed? Can the arbitral award of the Arbitrator be challenged? if so, how? what the evidences to be produced to prove that we have not been called for negotiations.Kindly advice,any one, who are well acquainted with the procedure.Thank You.