Vodacom bad service

Once again Vodacom did not deliver on their promises. My wife called them, and another service request was opened. I was told that a technician will contact me to come to resove my issue with my Fibre line....that did not happen. I do not know what else to do. Vodacom expect me to continue to pay for a service which I do not get. I can not cancel my contract, because I will end up with a bad name. Please, is there anyone that can help me?