xfinity now tech apointment

I have xfinity now prepaid service but I don't have a cable outlet installed in my apartment. After SEVERAL tries I was able to book an appointment with an xfinity technician but he was unable to complete the job because the work order he received was for external work only not internal. If am unable to get an xfinity technician can I have a contractor install an outlet or does xfinity have to do it.