Poor customer concern

Our household recently got access to Fibre Optic cables in Greenside. To my delight we signed a contract with Vox Telecom for 1 year of data over fibre cables (20Mbps line, inclusive of modem etc). When the technicians came to set up on Wednesday the 20th June (I was not home however my domestics were) they had spent less than 20 minutes setting up. They did a poor job as they did not fulfill any of my requests. They did not set up the wireless repeaters, they did not properly install the existing LAN cabling, all they did was take it out the box and plug it in! A simple task I could do. After promising to come fix the problem on both Thursday and Friday (it is now Sunday) I have got no response and empty promises. I am receiving speeds of 4-16Mbps when I run it through a speed test as well as constantly having disconnection problems...While browsing the internet this evening I got disconnected while busy and could not reconnect for at least 10 minutes (I recorded a video of part of the painful process for evidence). This disconnection issue has been happening since the installation on Wednesday and no effort has been made in order to rectify the problem.