Technician visit no-show, no complaint process

My WiFi has not been working for over 2 weeks.  I scheduled a visit for today from 1-3pm.  I waited the entire duration of the service period, and at 3:09 got a text message stating that my appointment had been rescheduled to Monday morning.  I called customer service, and they informed me that there is not even a technician on duty in this area today.  Why was I not notified of this when attempting to schedule?  Or the morning of the appointment?  Why did Cox wait until after my appointment window had been missed to reschedule me?  

When I asked the woman on the customer support line how I could raise a complaint about this and bring it to Cox’s attention, she stated that there is no way to file a complaint.  The website seems to corroborate this, as there is no support email or message page where I can submit feedback.  Extremely poor customer service on behalf of Cox.