Modem frustration

Because my Cox Gateway modem.wouldn't allow the set up of a guest network, I bought my own, a Netgear Nighthawk. Got it set up and called Cox for activation. Agent activated the modem but it wouldn't connect to the Internet. Said it was probably my coax cable (of course, it's always the cable even though it was working fine) and set up an appointment for the following day. Asked if I could continue to use the Cox modem and was told yes. Tried to do so but no luck. 

Got back to a live agent via chat for help. Saw on my profile the equipment was still showing as the Nighthawk. Told the agent i wanted to go back to the Cox modem until the tech arrived. We stream so without an Internet connect no TV. They kept asking me what the modem was doing and to reset it. Did that, no luck. Then they tried to sell me on an upgrade. Said that the new Cox modem would allow for guest networks. Eventually, I agreed but only if we could get the Internet running again with the existing Cox modem. He said sure and submitted the request. Said the modem would be shipped and delivered the next day. I noticed that the equipment on the app still listed the Netgear modem. Told him that and he said he couldn't change it since he submitted the upgrade request. But, reiterated that the new modem would be delivered the next day. 

Finishing up. Canceled the tech appointment. Found out that the modem will not be delivered today (at time of this writing, UPS hasn't even picked up the package), and I am left without Internet service for who knows how long. Not that there is anything like the Super Bowl bei g televised this week. 

Extremely frustrated.