How can I complain?

I was with an rsp and did a simple churn to Leaptel, in the churn NBN made a mistake and broke the service. They sent out a tech, who determined it was not an onsite issue and was an NBN internal issue and would need to be fixed by their network team, the next day they sent a tech out who determined it was not an onsite issue and was an NBN internal issue, 4 days later they sent a tech out, and you guessed it determined I was an internal issue. I’ve just had my 4th tech out in almost two weeks who again determined it’s not an onsite issue.

Leaptel have been responsive and helpful throughout but are unable to solve it because it seems as soon as the tech leaves site Nbn do nothing and then just send another tech out to site. What can I do here? Apparently there’s a case manager assigned inside NBN but leaptel have never once been able to actually speak with them.

It’s beyond a joke and the NBN seem beholden to no one.