Failure to cancel contract

I app**** for a contract online. An agent called me and we finalized the application. I received the device with a sim card, however the day before I also received a sim card. I tried calling but I was sent from pillar to post, eventually someone told me that I have to call the couriers to come and collect the extra sim. That didn't make sense so I went to the Telkom direct store in Promenade. There I was told that I would be charged if they had to cancel the extra contract (keep in mind that I did not apply for the second contract). After numerous calls and requests, this extra contract is still reflecting on my account and I will be billed for it. Apparently Telkom is known for not wanting to cancel contracts so I guess I'm just another victim of this ****.