Poor service

I have a discovery credit card with a monthly payment that went of on the 19th of each month. due to conditions outside my control, I did not had the funds available at the 19th August. I contacted Discovery and requested that the debit order date be changed to the 28th of each month. I was then told by the assistant that I first need to pay the arrears and then change the debit order date. arrangement was then made for the end of August to pay the arrears which was accepted and payment was made. I then made arrangement for the debit order date change also which was done and accepted. On the 26th September I received a message from Discovery stating that payment is overdue yet the debit order went of on the 26th Sept for the arranged amount. On the 27th September I received a message from Discovery acknowledge the payment made as received. To date the finds is not released and for the past week I am trying to get this sorted with no success.