Trojan horse

In business, a trojan horse is an advertising offer made by a company that is designed to draw potential customers by offering them cash or something of value for acceptance, but following acceptance, the buyer is forced to spend a much larger amount of money, either by being signed into a lengthy contract, from which exit is difficult, or by having money automatically drawn in some other method. The harmful consequences faced by the customer may include spending far above market rate, large amount of debt, or identity theft.