Vodacom Fibre Failure

In May I had Fibre installed. Lydell Chetty promised that the first two months would be free. To my utter consternation I received a tax invoice demanding that I pay R885.49 at the end of June. I called *** to try and resolve but to no avail. Neither Lydell Chetty nor her manager Charlene Douwie has responded to my cries for a resolution. I only managed to get hold of Lydell on the 15th June and I told that I would not have signed up with Vodacom if there hadn't been a special. I also have an email confirming that the first two months will be free. I guess they **** now they are avoiding me. I've been trying since the 15th June for some kind of response and I've left countless messages but nobody acknowledges or responds or even wants to resolve my dilemma at Vodacom.