Poooorest contact centre service and incorrect information

I took out a data package with RSAweb. My debit order for March 2019 returned unpaid. On 25 March 2019 I received an email advising I will be handed over and listed for the amount. I made the payment on the same day and then on 1 April they submit a debit order that includes the amount I have already paid. I called their contact centre and the staff to advise thag the wrong amount and all they sayung is that they don't refund bank charges as my account is currently on a negative because I had in my bank account the R349 we had an agreement on. Now the bank charges me R150 for unpaid debit orders. This is not my fault, I communicated with RSAweb that the payment is made and no where in their response did they advise that the debit order for that amount was already submitted.