Furious with no service

A consultant contacted my wife, to sell her a package deal for R99. She comes home with the streaming box. Plugs it in etc etc. Calls on air, they put her through to DsTV, YOU need a premium subscription for the streaming package to work. No the consultant did not mention that anywhere.. now we have to pay R400 because yes the box is open because we tried connecting it etc. I really don't understand how people get away with not telling a client, you need a subscription before the box will work. I'm furious because of this service that is non existing...