Agreement not honoured but debiting my account

During the rand Easter show I subscribed to Sunday times via their promotion where they offered to deliver Sunday Times, Sunday world on weekends and The Times on a daily basis, ever since they have only delivered one Sunday Times on one weekend but they are debiting my account with the full amount. I have tried on numerous occasions to call their subscription centre to lodge a complaint however at all times one deals with uninterested call centre agents its either they promise to call you back of which they never do, they even go to an extent to insinuating that Sunday Times is doing me a favour, one even went as far as encouraging me to reverse the amount at the bank so that the subscription can be cancelled.