Failure with billing for services not rendered

I signed up for the fibre internet without any difficulty. The issue is the invoicing with added costs for items or services not delivered or communicated. The apartment had fibre already and the previous tenant also used webafrica. That said I was invoiced for fibre installation and delivery of a router. Neither services were provided or asked for as I clearly told webafrica that I already have a router and the fibre just needs to be activated for my account. I have further attempted to get in touch with webafrica for coming on 2 weeks but no one is available to handle any billing query regarding the invoiced items I want to dispute. There is no answer on any telephone number available. And there is no channel available to report any complaint.