Vodacom Fibre charging more than they should, this is terrible service

After I had a terrible experience with Vodacom Fibre last month, where I had to wait more than 3 weeks for a new router, they now want to charge me extra on my monthly account. I have phone them twice last week to have this issue resolved, but still no one has contacted me. It is like talking to a brick wall when you need something sorted out with Vodacom fibre. The person that I spoke to says that they are charging me pro-rata for my fibre contract which I renewed. But they are already charging me full price for my fibre line, so they have no right to be charging me again. I didn't get a new contract, I just renewed the old one, and the package is exactly the same. I am extremely frustrated with Vodacom fibre and their poor service.