Not canceling debit order after I made full paymen

I made a loan of R500.00 24 February 2015, 25 February I paid the loan in full via EFT now after a month they still have not canceled this debit order and they still list the loan as unpaid. I have been asked to send proof of payment to both these email addresses [Email Removed] and [Email Removed] proof of payment was sent through 25 February, 23 March, 24 March, 25 March and now 26 March I was asked to send it through again? If I do not get the record straight today I will personally cancel all other debit orders for other outstanding loans to this company, I will proceed with legal action, further more I will go straight to the ombudsman as well as the consumers protection board combined with all news papers in South Africa! I can not afford a double debit order to go through! I will also hold you liable should you send double debit orders though my account for any financial irregularities on my bank account!