Utterly disgusted client!

I went directly to the main branch on rivonia and had signed up a fibre contract, i did not hear anything after that. I tried getting hold of them time and time again. Nothing progressed. You call the main number and get placed on hold for 20 minutes and land up and wrong department which then puts you through to the correct department but then you get put on hold for another 20 minutes. I eventually gave up! Eventually the fibre provider contacted me in December this year to come install my fibre. Was so happy! Do you think I can get hold of my service provider to configure my router? No!!! You log calls on the WhatsApp group which then tell you they will call between this time to configure a router. You then make sure you are at home and available At the time they said (which means you leave your day job)and then no one contacts you!!!! They waste your time completely. I am utterly disgusted in their service and response time in getting things done! How do I cancel this and go to a provider who wishes to have my business!!!