Vodacom Router issues

I have a problem with Vodacom. U have phones contract with them , so I app**** for fibre the lady who was assisting me didn't tell me that it a Vodacom fibre I thought it was from metro fibre till the day they delivered the router from vodacom , they connected it , it worked for like 2 weeks after that it stopped working I called Vodacom they told me my phone are in areas so apparently they've linked phones and router so I told them i don't want their router I want to cancel because I was never told my lines were gonna be linked. It been months now the router never worked but every month they are sending me invoices that i need to pay for something I never used tried calling then they all told me I need to pay each and every month for router so my question is how do I pay for services that I'm not receiving worst part of it they say I can't cancel it. My phone contract is now in areas because they telling me I can't pay for one and leave 1, And at the same time I can't cancel it. Right now there is an invoice they just sent it states that it for the period of October. How do I pay for services that I'm not receiving??