Supersonic "poor service"

They are a supersonic disaster I registered for a fibre service from them, its been 3 weeks now and no feedback,I have asked to speak to a manager the call centre guys tell you that a manager will call you back and that never happens. Their turnaround time to provide a service says upto 14 days however 21 days later still nothing what a supersonic disaster!!!!!.Definately nothing supersonic about them at all.