Cancelled services still being charged

I Took out a month to month contract with telkom and only needed the line as i was told they give such bad service, in the month i took it out i had the data cancelled as i only needed the line. 5 months down the line im still being charged every month i call the call centre hold on for 2 hours and they tell me \it will be rectified"What a sack of bull!!!!!<br> <br> I want a full refund on my account and i will cancel this line.<br> """