Internet won’t connect

I just moved. I’m a long time Xfinity customer. I plugged into the coax cable at my new place. It didn’t activate/set up. I used the chat bot and spoke with an agent. After an hour the agent ghosted me. I talked to the previous tenant. She used ATT and a CAT5e cable, not COAX. All I want is a tech to come out but the live chat won’t let me schedule one. Considering switching to ATT