Liability for unsolicited assignments

Questioner

How liable am I for an invoice if another person (a vague acquaintance) (to whom I am not legally bound) instructs a company to, for example, prepare a report for me?

Lawyer

If you were a bit more specific, I could give you a suitable answer. But in principle, as you describe it, it seems to me that you are not liable for the costs for which someone else has given an order.