Lack of communication and Misleading clients

It is funny how the Banks never explains anything to you until everything is set and done and they know you have signed all the necessary documents and they have leverage over you . So we went with Nedbank for our home loan, and before we signed we kept on asking them when should we expect our first bond deduction, because we wanted to be safe, but because then we had all the powers, they kept on saying they don't know, we wanted to understand if we where going to be given a month before our first deduction, but they couldn't give us enough info. so we went on with the application, hoping should we apply we would be given at least a month as they did not want to give us info. the house was registered on the 26th of April under our names, and still we got no communication from Nedbank. On the the 3th/4th we called again to find out when should we expect the first deduction and to our surprise they already debited us, but we did not have the money in our account, so probably it bounced back. we called again today 7th April 2018 to find out why we where not told and they took us back and forth, every person we spoke to kept on saying they cant help us.. I am really disappointed with Nedbank service and lack of communication. should Nedbank given us all the info we needed to know we wouldn't have been in such a mess.