Internet down for 2 weeks plus

we have had no internet for two weeks. Cox convinced me to change out the modem/router. No change, The modem is searching for a signal that it never gets. Requested service call to inspect their property from the street to the house. Tech was told no one would be home but to test their end of it. Tech arrived, on time. and called me. Said he had to get in the house. I told him what the service call was for and what not require entry. He left and cancelled my appointment! I have been on the phone, done hours of texting and no one can tell me why he left without fulfilling the appointment. Would not answer his phone and would not call back. This is not customer service! I realize that there is a possibility that the problm is in the interior cable and once they verify that their part of it is functioning we could set up an inside appointment. 

Besides checking for a signal inside, what more do they need access to? No one in customer service seems to be able to answer that question.