A BANK YOU CANNOT TRUST TO MANAGE YOUR FINANCES CORRECTLY

I have recently requested the change of my debit order date for my credit card by my bank. The consultant assured me that the change was made, then the debit goes off on the wrong date again and I had an unpaid debit. I then called and spoke to Kevin Sinclair (a FNB manager), he had a very bad attitude and promised to resolve the issue, to date I have not received a call or feedback on my query, in the mean time, my credit rating has been prejudiced. Furthermore, I cancelled my credit card and settled my outstanding balance in full and today the 21/09/2017 I got another sms saying that they did not receive my credit card instalment, I don't understand cause I cancelled with them and got confirmation that it was cancelled and settled in full. I got 2 unpaid debits which are not my fault and now my credit score is taking a beating cause of FNB's incompetence. I am going to cancel all my accounts with them and move to a bank where I would be valued as a customer cause despite numerous requests no one calls you back and the consultants that deal with me are so ***********. I am sadden by this experience as I always believed FNB was a great bank but I was sorely wronged and am not sure if I can proceed with bank like this. Again today I asked to speak to a mansger and it is close of business and no one has called. I will put this same complaint on Twitter, Facebook and all other social medias if someone does not call me to resolve this issue as I have been more that patient with this bank - my quey is from the 16/08/2017. Pathetic Service.