Bad service recieved from Supersonic

On the 14th of March 2021 Evotel came to my house to install and activate my Fibre line. The service request was also sent to Supersonic on the same day. There after I recieved a email from Supersonic saying that the installation from Supersonics side will take place between 7 - 14 working days. On the 29th of March Supersonic sent an email saying that they will schedule a technician to come and install a router. On the 9th of April there still wasn't any router delivered to me. I did make a follow up everyday more than once. Everytime I phoned they told me that my information was not on the system. On the 9th of April I sent an email saying I want to end my service with them. On the 13th of April one of their managers phoned me to ask me why I want to cancell my Fibre line. He was very rude and told me that I had to pay all the installations done at my house. After that I recieved a email saying that I must pay the cost of promotional value 24x remaining months of the clawback period. I did not use any of their services because there was no router delivered or installed. I did not sign any contract saying that I am happy with their services and that I am agreeing to pay them for the next 24 months. Supersonic does not want to release my Fibre line so that I can move to another setvice provider before I settle my account with them for no service provided.