Cel C Just keeps on deducting after contract termi

My contract with Cell C expired 6 Nov. I hacve notified them of contract cancellation beginning Oct and received confirmation via email. Two weeks ago I was contacted and offered an UPGRADE (how this is possible if I have no contract is another question?) I took them up on their offer only to see the SAME contract offered for much less on their website. I therefore cancelled the upgrade and didn't take receipt of the product. During my conversation with the agent I was told that my NEW contract would only start being deducted END DEC. Now I see R217,99 has YET AGAIN been deducted ********ly of my bank account. I demand a refund as well as any bank penalties due to me for their ******** action.