Awaiting feedback on my alleged consent to a new contract for weeks!!

i was told that the battery on my unit had expired 3 years ago and that altech would replace it free of charge. I went to the altech store and had to wait 4 hours when I was told it took 2hours. At the end of the month I was debited R262 instead of the usual R63. Upon enquiry I was told that I had taken a new contract.i disputed and asked for a recording. Have not received feedback for weeks. I want my account cancelled. I keep getting SMS messages that I need to pay but I have asked on numerous occasions for my account to be cancelled as I did not consent to a new contract. Please provide feedback as I will be keep record of these complaints and attempts at communication when I take further legal action.