Lacking and rude communication!!

If I can give them a 0 rating I would at this moment for their client service and communication!! The communication from the accounts department is either non existent or just plain rude and I feel that is no way to handle any client ever.

I received my statement from them in March saying our account balance is R0. Our debit orders gave some problem so I paid manually for each month after that, I then saw somewhere between march and now there is an extra R999 added to my account balance. I have spoken to two consultants where one was very rude and just hung up on me, and the other one when I took 3 minutes to go to my banking app to get a statement she asked for she ended the chat because according to her I am not responding quick enough but looking back she took an average of 3 minutes to reply to me. I have send two emails with all the proof of payments where I have not received one single correspondence and this was over a month ago. Now I just cannot get a hold of them!