No ADSL service

Upgraded from 4meg to 10meg uncapped. At first slower speed than when on 4meg, now no internet. Logged a call on 21 July. Cannot get any feedback from the call centre. They escalated the issue and send emails to the technical department. Often get told the technical department will call me back. No one ever does. Today when I called to complain the call centre agent eventually put the phone down on me. I wanted answers and am tired of hearing that they will send an email to the technical department. I wanted to speak to someone that can actaully sort out my problem or at least give me some progress.