Total lack of support for billing and technical inquiries from Cell-C Fibre

I subscribed to Cell-C Fibre about a year ago. Since then, although I've had no complaints re the fibre connection (Vumatel), I've had a couple of issues:

1. The supp**** WiFi router needs to be reset every 3-4 days (turn off power, wait 1 minute, turn it back on) otherwise neither the WiFi or ethernet ports will allow any internet traffic. 2. After struggling for a number of months to access my invoices (only available online, and apparently easily accessible if you are a Cell-C cellular subscriber, which I am not), only to find that I've been double billed for my Fibre connection (2 connections - no wonder my account is so high). I've been trying to get a hold of anyone at Cell-C since August 2018 - to no avail. There is just no answer to any email to the account department. There is no answer from the "account manager" on her email address. I did speak to a consultant (cost me nearly a R100 phoning them as the only number available is free to, guess who, Cell-C Cellular subscribers), only for the person to tell me that I need to contact the account manager, but that he will also notify her as well as the support/accounts department as to my problems and that they will contact me. This has not happened since August 2018. I recently, around two weeks ago, again started this whole process and actually have two support tickets logged!!! BOTH of them (in the email I received) stating that they (Cell-C) will be in contact "shortly". Now, in my mind "shortly" means a couple of hours, or at least by the middle of the next business day - I've had no contact from them whatsoever!