Non Cancellation of Debit Order

In April 2015 I cancelled my Account. In November 2015 I noticed that they were still billing my account and I disputed it. They refunded my money in January 2016 in the amount of R 1768+-. In February 2016 they continued with their debit order. I tried to phone them and received no response, so at my expense I reversed the debit order. On 01st March 2016 they double debited my account in the amount of R 442.00. I want a refund of my bank charges for February and now March 2016 and they must stop debiting my account. This is *****