Pathetic Service of Cell C.

I am disgusted by the customer service I recently received from Cell C. I was offered a Data contract by a sales agent. I told him my phone does not have a dual Sim card so I won't be able to use the card. He then told me I don't need to insert the Sim in my phone, I can just activate it on my Cell C mobile app, which turned out to be a lie. I tried to cancel the contract without any success, they transfer you from agent to agent and then finally cut you off. How can they lie to you and then refuse to cancel the contract as they gave me the wrong information. I asked them to listen to the recording of the call, and they keep on insisting I agreed to the contract, which I did, AFTER THEY GAVE ME THE WRONG INFO.