MFC blame you for their failures and make it hard to resolve with no help from them

I received an SMS from Nedbank MFC, Urgent notice, they have not received my payment as per their recent arrangement and to resolve this i must call them urgently and they listed a number, i called the number.. 1st time on the phone 11Min 33 seconds being passed from pillar to post and then phone going dead, i tried calling again this time on the phone for 6 minutes when i was just abruptly cut off after telling the lady she is now person number 8 I'm speaking to, i then called a third time, spoke a lady telling me she will transfer me to another lady, only to be met with a voice message this person is unavailable and the call died, 3 minutes again they have a debit order with me, they failed to take the cash and are now making it hard for me to resolve... their debit order failed, and the cash is there waiting for them, is not my problem, if they want their money, they can call me to resolve this, i tried 3 times and they don't seem to be interested in resolving this , who will now be reimbursing me for the 20 odd minutes Airtime i have just spent trying to resolve THEIR issue,