NEED SERVICE NOW - PAYING DOUBLE

I am so frustrated. It has been a year battle with WebAfrica, regarding getting Fibre installed. We finally got service last month and they organised to install Fibre. We were insured that we will not pay double as we were on LTE. Now we receive a invoice and we are paying for both the LTE and the Fibre. This is unacceptable and I would like to talk to a person to fix this right away. WebAfrica's WhatsApp service is clearly not working.