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You must not sell anything before physically possessing it. As for taxis, the service is permissible but there are few things to be avoided. Such things don’t make the business haram but one must take his precautions.

Allah doesn’t accept except what is halal. Such charity and zakat of this haram earning is not benefiting him at all. He must resign immediately.

It is not permissible for you to drop them or to stop for them to go and buy pork or a beer. Use the van only for work related activities.

As long as you don’t mix and he doesn’t see your face or hear your voice, this is permissible.

The wives of the prophet salla Allahu alaihi wa sallam were ordered to stay home and not to leave unless it is needed. This also applies for other women. They can work if it is segregated and their guardian allows it.

You must not take passengers carrying alcohol or be alone with women.

If they are saying this to other employees or other people, this is backbiting. If they are evaluating a certain employee with other managers purely for professional reasons, they can use more diplomatic language  in order to avoid speaking ill of that employee.

If it sells cat, dogs and other pets such as snakes, this is prohibited to work there.

You must leave this job at once and repent to Allah because your earning is haram and this is why you feel depressed.