Unfair Practise

I asked those attorneys to change my debit order to a different Bank account three months ago. The person told me it was done. Then I spoke to another person at the call center a month later and they said they can't do it a consultant will phone me, but no one phoned. Last month they phoned me again and I explained to them that I could only pay R150.00 instead of R200.00 and want to change my Bank details. They informed me that they cannot do a Debit Order bellow R200.00, but will cancel my Debit Order and I can pay manually which I have been doing and they will update their system. Now I get an SMS that they will deduct R200.00 again. I am sick and tired of this problem and until they sorted out I will now pay nothing.