Charging me for cancelled products

I was phoned last month by Vodacom and the lady upgraded my contract as an upgrade is now due. She gave me the option of not getting a new device which I opted for so my monthly payment would come down considerably as there is no device charge. She also cancelled my old Wifi contract for me as they never did that when I got my new Wifi router and contract. She assured me that no more money would be deducted for the old Wifi, only the new. Now come yesterday the exact same amount as previous month was debited from my account. Please change this and refund me my money that you are *****ing. In fact the few months I paid for 2 wifi's instead of 1 you should actually also refund me for as you were supposed to cancel it. Please get your act together and sort out my account!