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I have contacted support by phone and by cell phone message and Cox app on cell home requesting service tech to come and see why I do not have a dial tone on my house phone. After about 5 tries, I was told I would get a message and email with Schedule. Never got any response. Phone still dead! Now 3 days!
Due to Covid-19, Cox isn't entering houses/premises, only outside work. That could be delaying the appointment. Try emailing Cox at firstname.lastname@example.org with your account info and a link to this thread and see what they can work out for you.
try another phone jack as a test.