MWEB charging me for a service I erroneously took and cancelled

Good day, On a Saturday, I mistakenly clicked an offer for a Norton VPN contract, and when I saw the mistake, I immediately cancelled the Norton VPN as I did not need it and don't know how to use it. After cancelling, I received an email stating that they were charging me for a pre-mature cancellation of VPN to the value of R2160. I then phoned MWEB requesting that it be cancelled and I do not agree with the cancellation amount charged. The guy I spoke to said it would be tricky to cancel as it is by an external provider. He said he would come back to me and never did. On 31 August MWEB deducted the pro-rata VPN amount from July and a full installment for August 2023. This is daylight ******* and unfair on me. Today 04 September I phoned MWEB and the lady asked me to hold while she investigated and I held on for about 10 minutes following which the call was dropped. I need MWEB to please cancel this urgently as I cannot afford to pay for the VPN. The cancellation amount was equally unfair to me when I cancelled quickly. They can check how long it took me to cancel, they will see it was not used even for a second. This is not the device that I opened and would have been compromised and therefore cannot be returned. It is a service that mistakenly took and when I saw the mistake I wasted no time in cancelling. This is really unfair to the consumer.