Appalling service

Unbelievable, I wasted 2 months waiting for these clowns to install my broadband. The first installer they sent said he couldn't connect to my existing NBI connection already in my house. Note, Pure are listed as a partner on the NBI website. He said he had to use a fibre box on a pole 30 meters further away from my house. For this he needed a cherry picker which he didn't have. So, 5 weeks later, a second engineer arrives to install my broadband. He says I need an "order change" to connect to the existing NBI fibre end in my house. So we call Pure. They say that because I'm using the NBI connection they will have to charge me 20% more than my contract price because the minimum NBI speed is 500Mb/s. I only want 50Mb/s as per my contract. The Pure agent went off to speak with his boss. The line went dead, after 10 mins. I called them again, got another clown, who, despite my explaining the situation insisted on going through unnecessary security questions. He interrupted me several times, and wasn't interested in resolving the matter. Shocking customer service. A bunch of clowns who don't know what they are doing!