Worst service from Vox Telecom

I have been struggling with Vox Telecom for over 3 months to install a fiber line to the property. Every time I speak to a consultant they say they have escalated it. When I want to speak to a sales manager the consultant say that the sales manager will phone me back, to no avail. I don't know what to do as my tenants want to move as they need fiber to work from home. I am standing the possibility to loose tenants!! This the worst service I have received from a service provider. But be sure if you debit order is missed they get hold of you immediately.