Someone claiming to be an agent and selling a commodity then wishing to return the right

A: You were wrong in telling the owner of the car other than the truth, for this is lying and dishonesty. You should offer Tawbah (repentance), seek forgiveness from Allah, and return the rest of the money to the car owner. However, if you can not reach him, you must donate the money to the poor with the intention of paying it to its owner. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.