RAIN IS A BIG ****

Rain is a BIG **** They sold me their router for Wi-Fi connection, I was told that it's NOT a contract and my connection will be enabled by monthly payments , meaning that if I miss a payment, network will be taken off. According to my knowledge I only owe them 1 month payment but they are now busy flooding me with "Final Notice of Demand" messages with an outstanding balance of R1979.9, really now how did we get to that?? I even got calls demanding the payment of which I asked the consultant but never got a proper reasoning, instead I was told that I accepted the router and the fee is for the router, even though I asked that they come and get it as I don't wish to use it anymore, the router is still in perfect condition and the box is still kept along with the cables. They had previously said if I want to terminate the service, arrangements will be made for the router to be collected without a charge. When I mentioned that to the consultant that phoned for the payment demand he told me that I should just pay the money and throw away the router or give it to someone else 🤔.