Fed Up of the incompetence!!!

I tried to upgrade my Telkom line to a fibre line, this was about 2 months ago, i have had to call in at least twice a week since then and receive a different answer from every operator, apparently there was an error which caused the engineer to put a hold on the order, for 2 months though? Every operator tells me that either the engineer will contact me to explain further or that is no less than 24-48 hours and engineer will sms with the installation date. The most recent appeasing call was the operator who told me that the engineer has been booked for Tuesday the 3rd July 2018 as it was the earliest available date. Friday the bill comes, i have been billed for May-June and June-July, the service is not even installed. I called in to query this, the lady checks the system, there is no engineer booked to come out to me tomorrow, the order is still on hold. This review was the last resort, i am extremely furious. How can this possibly happen is such a big organisation? Absolutely nobody can assist and there's never anybody higher that i can speak to.