No response and refund, extremely poor customer service

I accepted a contract in March 2022 for uncapped /unlimited data for R499 and a 10 day cost free cancelation period. I received the router on 15 March and to my surprise it's not uncapped it's up to 400gb. I returned the router on the 22nd and I was debited R672 and will be debited again with R2414 on 25 May. No refund and no response.