Unfair billing and forced to hold on to router I don't use

Hello Peter On the 9 November 2021i took contact with voxtelecom and on the 12 November 2021i recieved router plus sim that was couried to me inside the package the was a message that I should wait 24hrs before I can connect I waited and o the 13 November I tried to connect and I couldn't connect with my phone I couldn't connect and on the 15 November wrote email to voxtelecom eplaing that I can't connect and I got no response.on the 17 November 2021i wrote again explained that Idon't have Pc and I can't use dialup connection and I got no response and on the 22 November I wrote a cancellation letter and immediately cause i use their service and no assistance from their side I recieved a response that the acknowledge the cancellation and is set for December I wrote again that I can't keep something that is not work the response was they will send a courier to collect the package and insisted on December cancellation the send me statement of R891.31 and R299 who can I pay for something that I haven't and can't use lack of response from them when I requested shows me that they knew that the wa something wrong with the router and sim after the conversation on the 22 technician called and I explained that I have cancelled the contract I'm asking hello Peter to assist me with the matter