All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
Your work is acting as a broker between the buyer and the seller and this work should be based on truthfulness and honesty. The customer or the client (usually) believes the broker in this sale. Therefore, if the broker knows that there is a fault or deficiency in the goods, or knows that the director of the company lies to the customer, then the broker is not permitted to conceal the deficiency or to accept the lies of the director.
As regards the commission that the agent (broker) gets from the company, then it is permissible as he receives it in return for a permissible work. The fact that the director lies to the customer does not affect the permissibility of the commission he gets, however, he [broker] is obliged to advise the buyer when it Islamically becomes obligatory to do so.
Allaah Knows best.