Cancellation of Contract

I went into a Vodacom Shop, Maxwell attended to me and before I could finish the word cancel he was ready to send me away. I had to explain to him for a good 10 minutes that I do not have a device to make a call from since this was a data contract and my current phones uses a micro sim and his response \Can't you make other means". I said being in a Vodacom outlet is making other means. I then told him I am not going anywhere without help. Maxwell then attempted to be opening a computer but in less than a minute told me that department closes at 5. So Vodacom since I work till 5 it means I will not be able to cancel my contract? My contract ends end of this month and I don't want it anymore please and since I don't have a device to call you from I hope from this you will be able to since I can't get to an outlet before 5. I wish it was as difficult to sign up a contract with you as it is with finishing it off. I don't know the number to the data sim"""