Unfaithful and unprofessional Cell Direct

Someone from Cell direct gave me in January updating me that my Telkom wi-fi contract is coming to end and I'm due for upgrade, which I agreed to upgrade for an unlimited data .

He said they will deliver a sim-card that will be active after I receive it and then they will deactivate the current account end of Jan then I will pay for a an upgrade end of Feb. Then End of Feb double debit took place, I called them and they promise to correct it and refund me of which they didn't. End of March double deduction AGAIN, I called again and they said they will refund me after 5 working days, 5 working days passed, even 10 working days, when I called again they are keeping me on hold for over 7min without comming back to me several time,

This makes me worried now that they will do double deduction for the 3rd time without any refund, Now if I don't get my refund I will have to cancel the current contracts and move to a new service provider, I'm really tired of these people.