Can a company send one an unwanted product and then claim money for it?

This has recently happened to my friend: My friend is a subscriber to a magazine which had sent a book by parcel. Since she was not at home when the postman visited to deliver a parcel, her mother, without knowing what was inside it, signed on the receipt with the postman and received the parcel. Later when my friend opened the parcel, she got a book with a claim for Rs 699. The fact is, no one ordered the book by post, in fact no prior information about the book was given earlier. On the backside of the bill it is mentioned in extremely small font that the company does this as promotional offer and "expects" that the receiver will be interested in receiving such offers. This had already happened once earlier. My friend sent a cheque for a book which she never asked for. Can anybody please tell what to do in this situation. If my friend intentionally does not send the money (since she in not interested in the product), will she do something illegal? Or is there anything better that she can do?