Is It Ethical To Send A Fax Advertising Your Goods Or Services To The Recipient?

I have a fax machine and I keep getting faxes advertising goods or services. When I get into my office at home, I find the faxes are already printed and I have paid for the printing myself when its about other people’s busnesses. Is this ethical? Can I do anything about it without incuring further costs? Can I send them a printing bill? How much would I have to charge?

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