If you receive supplies or bills for services you didn’t order, don’t pay, and don’t return the unordered merchandise. You may treat unordered merchandise as a gift. By law, it’s illegal for a seller to send you bills or dunning notices for unordered merchandise, or ask you to return it — even if the seller offers to pay for shipping. Further, if the seller sends you items that differ from your order in brand name, type, quantity, size, or quality — without your prior express agreement — you may treat the substitutions as unordered merchandise. Unordered services are treated the same way. However, first consider the possibility that the seller made an honest mistake.
federal laws make it illegal for companies to mail unordered merchandise to consumers and then demand they pay for it. If you receive an item you did not order, in most cases you have a legal right to keep the shipment as a free gift.
While the law does not require it, it's a good idea to send the company a letter that says you plan to keep the shipment as a free gift. This letter may help the mistake, or it may encourage it from sending you more bills. You might want to send this letter by certified mail and keep the return receipt. Also keep a copy of the letter.
If you received unordered merchandise that appears to be the result of an honest shipping error, write the company and offer to return the merchandise if the company will pay for the postage and handling. Give the company 30 days to respond. Add that if the company does not act in the time period, you will keep the merchandise.