No Response on billing enquiry

I have been a loyal webafrica subscriber for some years now. I have recently installed fibre at one of my properties. During January and February the line was unstable and we did not have internet connectivity for some days. I logged calls with webafrica who told me my invoice will be adjusted for the down time. In addition to this i paid one of the invoices in full only for the system to reflect this as not paid. I have sent emails to their billing department and support email addresses on the 30/01/2018 and again on 03/02/2018 with no response. When asked by my colleagues and friends which provider to use for their ISP i have recommended they stay clear of webafrica. Poor poor customer service