Telkom - how to be let down with a bang

Last June (2018) fibre installation in our complex was completed by Vumatel. I app**** for a 2-year contract with Telkom with a free modem and was assured that a technician would deliver same and make sure everything was connected and working properly. I am still waiting for a modem, let alone any help. Phoning Telkom is a waste of airtime, if you ever manage to reach a human being you will get no answers. Towards the end of last year I was phoned by a courier who had a parcel for me from Telkom, presumably the missing modem. They had sent him to a 2-year-old address, despite all current details being clearly detailed on the application. The Telkom shop couldn't help either as first of all they said they couldn't find any record of my order and then for some reason told me that I had ordered a month-to-month service and the only thing they could do for me was to sell me a modem! I have now given up in despair, Telkom is well and truly in breach of their contract with me, which I now deem to be null and void. I only hope another service provider will be more efficient - they certainly couldn't be worse!