Disappointed new client

I am so disappointed in Nedbank. I recently app**** with Nedbank for a bank account and credit card as I left my previous bank because of poor service. I was so happy after seeing the consultant and taking me through the different options they offered. We finally agreed on one and I was happy with the benefits and everything and I also her I wanted to apply for the credit card of which she said someone was gonna call me back. I received my bank cards promptly and I was excited. Someone called me to from Nedbank and assisted me with setting up the App, this was a week later. And I so happened to ask the lady to check for me if the rebate was done as this is what I was promised when I took the account. At the branch the lady tht assisted me said she was going to sort it out on Monday as I went on Saturday and it was already home time. She told me everything will be fine, she will do it 1st thing on Monday. So when I asked the lady that called me she said it was not done and she will escalate and come back to me. She never came back to me, no one at the branch called to say what was going on as I was promised a benefit and it is what attracted me to the bank as I was looking at different bank. I finally went into the branch and was told that they made a mistake. I am so disappointed I Nedbank, this is my first interaction with them and already receiving such service, it's really disappointing that I don't know whether it's a good idea to still continue with this bank or I should check elsewhere.