Still debiting my account when account closed

On the 27 April 2015 , i closed my Landline and adsl with telkom as i felt i was not using it. Telkom would debit my account randomly from the 30 of the month when i specifically asked for the debit orders to come off after the 3. Thus causing the debit order to bounce, and leaving me with a R60 bank charge every time this happened. My services were then disconnected on the 29 April 2015. i have now received 3 more debit orders off my account. One the beginning of May, wish i understood was for the previous month. But also beginning of June and now beginning of July. I am being billed for something i am not using. I phoned the 10210 on the 2 June 2015. ref no. ***5, and was told that it would be resolved by the 9 June. and i would be refunded. i have had no correspondence from anyone, no refund and charged for July as well!