Is money earned from writing advertisements for someone around whom complaints of injustice or lying are frequent, even if you continue to advise him and help those affected, considered to have an element of doubt or to be unlawful, or should one stop working for him?

What customers claim against the employer regarding violations, which he denies, does not affect the ruling on the questioner's work with him in writing advertisements, as long as the advertisements themselves are permissible. If the employer commits violations, the sin is on him alone, and he should be advised and admonished. If the questioner's field of work is permissible, there is no harm in him remaining in it and benefiting from his wages. The man and the customers should be advised if they are falsely accusing him.