Unauthorised debit orders

Sometime in February I got a call from a lady (Thandeka or Thandazo) who was calling from the Ignition Group on behalf of Telkom mobile, she was promoting a sale of a nokia phone that comes with a Sam sung tablet, I advised her that I'm not interested in that combo but would rather buy a Note 4 and we agreed on that sale. Two weeks later they delivered the combo that they were promoting instead of what I had agreed to buy, I called their offices spoke to Amir and asked for the contract to be cancelled and their phones to be collected, the phone was collected on the 26/02/2015 at 15:33 by Ram. On the 25/03/2015 two amounts were debited from my account by Telkom for that contract that I had requested cancellation of, I contacted their offices on the 26/03/2015 on *** and spoke to Amir again to enquire about the debit order he said he remembers the query and he will look into it and get back to me but to date he never did. I went to my bank to get both the debit orders to be reversed (which cost R20 per reversal) to my surprise another R203.75 was debited this morning (15/04/2015 ) by Telkom mobile again. I tried calling the call centre number but there is no response.