Incorrect billing of a router that is not working

In March I app**** for a Fibre which vodacom approved it end of March and in April they send me a router together with a LTE stick, and told me to use it while I wait for the installation of Fibre. The router they gave me is not working and they are billing me monthly an amount of R1030 for a router that is not working or of beneficial to me and my family. I have logged multiple calls with vodacom since April regarding the router that is not working and the incorrect billing of the router because they told me is free. The will only bill me for the 100g data but to my surprise the data is more than R1000 now. Vodacom is not being fair to me as I am paying for a router that is not working. When I call they are always escalating the matter. I am tired of vodacom and their ****.