Gateway charges

Hello, I have a question about how the charges for Gateways work. I recently changed my plan and I wanted a new Gateway since the one I already had seemed spotty and so that was an extra charge. However, I never got any notification of it getting shipped or anything like that and so it's like I'm just being charged extra for the Gateway I already have. Is there something I'm misunderstanding about the way charges for Gateways work?