Still no service?

I received a self installation kit that included a router, a black power cable, a yellow cord, and a red cord. I plugged the power cable into the wall and into the router where the router then turned on. The yellow and red cable looks like something that plugs directly into your tv or computer for a wired connection so I’m guessing I don’t need them. After a few trials of trying to get the wireless to work, I contacted AT&T who said that for some reason they didn’t start my service and that’s why I wasn’t able to connect. But I had two people assure me that it would be up and running by the end of the day. The one even said they’re going to personally assure that it’s up today. Well after unplugging and replugging the router multiple times over the course of the last 8 hours since this happened, I still don’t have internet. There is a solid green light next to power, a sort of blinking light next to WiFi, and flashing red lights next to broadband 1 and 2. I don’t understand what’s going on?