Home loan

I know this will not even help but I am just so frustrated with the service at FNB. I changed my debit order date on the app for my home loan and I was informed it was successful. It was not. They still debited my account on the incorrect date. Took my how long to try and sort it out myself even though it was not my fault. Their debtors department put the phone down in my ear twice without even an hello. Phone another agent just laughed at me for being upset that no one can assist or even inform me on how to pay money into my home loan from another bank. But ye why should they care right. Service is not required. Today they phoned and still could not tell me how to make a payment from another bank? I will wait till they are desperate enough to get their money from me. I am tired of this.