I got ****med by mobile talk and now they are blatantly taking money out of my bank account for a product and service I cancelled and didn't receive

On 14 May 2019 I received a cold call from an agent named Yogash Pillay, he told me that the deal he had for me was unlimited data at a low cost...it was a lie of course and I stupidly took it. When it dawned on me that I have been ****med, I immediately contacted mobile talk support where an agent named Ntombifuthi Goba and I exchanged email after email trying to get this "deal" cancelled. Eventually she notified me that it was indeed cancelled the very same day I got ****med by Yogash. I was relieved but at the end of the month, three debit orders went off, one for the added services by mobile talk, amount R149 and the other two, R150 and another R150 right after for the "deal" which I was originally told was R109. So I contacted Ntombifuthi again and she said that there is a cancellation period of twenty days...that is absolute nonsense. So I asked her will I get refunded because I was billed for something I never received...she rep**** with a straight "no you will not be refunded". So I went to the bank and reversed the debit orders, within the law of course because these people were basically *****ing from me. I also notified them about the dispute and that I will seek legal assistance if they deduct from my bank account again. I also had to block them from my email to avoid being harassed by them.