Telmex fiber optic install question...

My old modem was showing signs of trouble, so I went on Mercado Libre and ordered a new one. Turns out I ordered a fiber optic modem. It has the jack for the phone line to plug into, and also a skinny one for the fiber optic which I don't have. Seems like it should work with the phone line plugged in, but no. The "internet" light does not light up and the laptop can't find it.

Is this thing supposed to work with or without fiber optic or did I just waste 12 bucks. That's American, so it's pretty serious money. BTW, I know it's supposed to be "fibre". I'm not French.

Anyhow, anyone has experience with this? Thanks.

The phone line jack is there to connect your phone to it. It isn't built as input line. So no it won't work without fiber optic.
You might can get your money back as you bought it through Mercadolibre though.