ISDN Line Fault

2X ISDN Line Faults were reported on 24 Nov 2015. 5 business days later we've had no response other than a fault reference number. The call centre response is that they have no contact with the technicians and that they will arrive on site when they have time. I also left my number for a manager to call me back, but that also didn't happen.<br> <br> Fault reference numbers: 4CTI241115 and 5CTI241115.<br> <br> We've had no available business lines (incoming or outgoing) for a week today. This is completely unacceptable and poor service to say the least.